/*  Prototype JavaScript framework, version 1.6.0.2
*  (c) 2005-2008 Sam Stephenson
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*  For details, see the Prototype web site: http://www.prototypejs.org/
*
*--------------------------------------------------------------------------*/

var Prototype = {
    Version: '1.6.0.2',

    Browser: {
        IE: !!(window.attachEvent && !window.opera),
        Opera: !!window.opera,
        WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
        Gecko: navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
        MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
    },

    BrowserFeatures: {
        XPath: !!document.evaluate,
        ElementExtensions: !!window.HTMLElement,
        SpecificElementExtensions:
      document.createElement('div').__proto__ &&
      document.createElement('div').__proto__ !==
        document.createElement('form').__proto__
    },

    ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
    JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

    emptyFunction: function() { },
    K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
    Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
    create: function() {
        var parent = null, properties = $A(arguments);
        if (Object.isFunction(properties[0]))
            parent = properties.shift();

        function klass() {
            this.initialize.apply(this, arguments);
        }

        Object.extend(klass, Class.Methods);
        klass.superclass = parent;
        klass.subclasses = [];

        if (parent) {
            var subclass = function() { };
            subclass.prototype = parent.prototype;
            klass.prototype = new subclass;
            parent.subclasses.push(klass);
        }

        for (var i = 0; i < properties.length; i++)
            klass.addMethods(properties[i]);

        if (!klass.prototype.initialize)
            klass.prototype.initialize = Prototype.emptyFunction;

        klass.prototype.constructor = klass;

        return klass;
    }
};

Class.Methods = {
    addMethods: function(source) {
        var ancestor = this.superclass && this.superclass.prototype;
        var properties = Object.keys(source);

        if (!Object.keys({ toString: true }).length)
            properties.push("toString", "valueOf");

        for (var i = 0, length = properties.length; i < length; i++) {
            var property = properties[i], value = source[property];
            if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
                var method = value, value = Object.extend((function(m) {
                    return function() { return ancestor[m].apply(this, arguments) };
                })(property).wrap(method), {
                    valueOf: function() { return method },
                    toString: function() { return method.toString() }
                });
            }
            this.prototype[property] = value;
        }

        return this;
    }
};

var Abstract = {};

Object.extend = function(destination, source) {
    for (var property in source)
        destination[property] = source[property];
    return destination;
};

Object.extend(Object, {
    inspect: function(object) {
        try {
            if (Object.isUndefined(object)) return 'undefined';
            if (object === null) return 'null';
            return object.inspect ? object.inspect() : String(object);
        } catch (e) {
            if (e instanceof RangeError) return '...';
            throw e;
        }
    },

    toJSON: function(object) {
        var type = typeof object;
        switch (type) {
            case 'undefined':
            case 'function':
            case 'unknown': return;
            case 'boolean': return object.toString();
        }

        if (object === null) return 'null';
        if (object.toJSON) return object.toJSON();
        if (Object.isElement(object)) return;

        var results = [];
        for (var property in object) {
            var value = Object.toJSON(object[property]);
            if (!Object.isUndefined(value))
                results.push(property.toJSON() + ': ' + value);
        }

        return '{' + results.join(', ') + '}';
    },

    toQueryString: function(object) {
        return $H(object).toQueryString();
    },

    toHTML: function(object) {
        return object && object.toHTML ? object.toHTML() : String.interpret(object);
    },

    keys: function(object) {
        var keys = [];
        for (var property in object)
            keys.push(property);
        return keys;
    },

    values: function(object) {
        var values = [];
        for (var property in object)
            values.push(object[property]);
        return values;
    },

    clone: function(object) {
        return Object.extend({}, object);
    },

    isElement: function(object) {
        return object && object.nodeType == 1;
    },

    isArray: function(object) {
        return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
    },

    isHash: function(object) {
        return object instanceof Hash;
    },

    isFunction: function(object) {
        return typeof object == "function";
    },

    isString: function(object) {
        return typeof object == "string";
    },

    isNumber: function(object) {
        return typeof object == "number";
    },

    isUndefined: function(object) {
        return typeof object == "undefined";
    }
});

Object.extend(Function.prototype, {
    argumentNames: function() {
        var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
        return names.length == 1 && !names[0] ? [] : names;
    },

    bind: function() {
        if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
        var __method = this, args = $A(arguments), object = args.shift();
        return function() {
            return __method.apply(object, args.concat($A(arguments)));
        }
    },

    bindAsEventListener: function() {
        var __method = this, args = $A(arguments), object = args.shift();
        return function(event) {
            return __method.apply(object, [event || window.event].concat(args));
        }
    },

    curry: function() {
        if (!arguments.length) return this;
        var __method = this, args = $A(arguments);
        return function() {
            return __method.apply(this, args.concat($A(arguments)));
        }
    },

    delay: function() {
        var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
        return window.setTimeout(function() {
            return __method.apply(__method, args);
        }, timeout);
    },

    wrap: function(wrapper) {
        var __method = this;
        return function() {
            return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
        }
    },

    methodize: function() {
        if (this._methodized) return this._methodized;
        var __method = this;
        return this._methodized = function() {
            return __method.apply(null, [this].concat($A(arguments)));
        };
    }
});

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function() {
    return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
    these: function() {
        var returnValue;

        for (var i = 0, length = arguments.length; i < length; i++) {
            var lambda = arguments[i];
            try {
                returnValue = lambda();
                break;
            } catch (e) { }
        }

        return returnValue;
    }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
    return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
    initialize: function(callback, frequency) {
        this.callback = callback;
        this.frequency = frequency;
        this.currentlyExecuting = false;

        this.registerCallback();
    },

    registerCallback: function() {
        this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
    },

    execute: function() {
        this.callback(this);
    },

    stop: function() {
        if (!this.timer) return;
        clearInterval(this.timer);
        this.timer = null;
    },

    onTimerEvent: function() {
        if (!this.currentlyExecuting) {
            try {
                this.currentlyExecuting = true;
                this.execute();
            } finally {
                this.currentlyExecuting = false;
            }
        }
    }
});
Object.extend(String, {
    interpret: function(value) {
        return value == null ? '' : String(value);
    },
    specialChar: {
        '\b': '\\b',
        '\t': '\\t',
        '\n': '\\n',
        '\f': '\\f',
        '\r': '\\r',
        '\\': '\\\\'
    }
});

Object.extend(String.prototype, {
    gsub: function(pattern, replacement) {
        var result = '', source = this, match;
        replacement = arguments.callee.prepareReplacement(replacement);

        while (source.length > 0) {
            if (match = source.match(pattern)) {
                result += source.slice(0, match.index);
                result += String.interpret(replacement(match));
                source = source.slice(match.index + match[0].length);
            } else {
                result += source, source = '';
            }
        }
        return result;
    },

    sub: function(pattern, replacement, count) {
        replacement = this.gsub.prepareReplacement(replacement);
        count = Object.isUndefined(count) ? 1 : count;

        return this.gsub(pattern, function(match) {
            if (--count < 0) return match[0];
            return replacement(match);
        });
    },

    scan: function(pattern, iterator) {
        this.gsub(pattern, iterator);
        return String(this);
    },

    truncate: function(length, truncation) {
        length = length || 30;
        truncation = Object.isUndefined(truncation) ? '...' : truncation;
        return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
    },

    strip: function() {
        return this.replace(/^\s+/, '').replace(/\s+$/, '');
    },

    stripTags: function() {
        return this.replace(/<\/?[^>]+>/gi, '');
    },

    stripScripts: function() {
        return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
    },

    extractScripts: function() {
        var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
        var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
        return (this.match(matchAll) || []).map(function(scriptTag) {
            return (scriptTag.match(matchOne) || ['', ''])[1];
        });
    },

    evalScripts: function() {
        return this.extractScripts().map(function(script) { return eval(script) });
    },

    escapeHTML: function() {
        var self = arguments.callee;
        self.text.data = this;
        return self.div.innerHTML;
    },

    unescapeHTML: function() {
        var div = new Element('div');
        div.innerHTML = this.stripTags();
        return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo + node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
    },

    toQueryParams: function(separator) {
        var match = this.strip().match(/([^?#]*)(#.*)?$/);
        if (!match) return {};

        return match[1].split(separator || '&').inject({}, function(hash, pair) {
            if ((pair = pair.split('='))[0]) {
                var key = decodeURIComponent(pair.shift());
                var value = pair.length > 1 ? pair.join('=') : pair[0];
                if (value != undefined) value = decodeURIComponent(value);

                if (key in hash) {
                    if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
                    hash[key].push(value);
                }
                else hash[key] = value;
            }
            return hash;
        });
    },

    toArray: function() {
        return this.split('');
    },

    succ: function() {
        return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
    },

    times: function(count) {
        return count < 1 ? '' : new Array(count + 1).join(this);
    },

    camelize: function() {
        var parts = this.split('-'), len = parts.length;
        if (len == 1) return parts[0];

        var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

        for (var i = 1; i < len; i++)
            camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

        return camelized;
    },

    capitalize: function() {
        return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
    },

    underscore: function() {
        return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/, '#{1}_#{2}').gsub(/([a-z\d])([A-Z])/, '#{1}_#{2}').gsub(/-/, '_').toLowerCase();
    },

    dasherize: function() {
        return this.gsub(/_/, '-');
    },

    inspect: function(useDoubleQuotes) {
        var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
            var character = String.specialChar[match[0]];
            return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
        });
        if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
        return "'" + escapedString.replace(/'/g, '\\\'') + "'";
    },

    toJSON: function() {
        return this.inspect(true);
    },

    unfilterJSON: function(filter) {
        return this.sub(filter || Prototype.JSONFilter, '#{1}');
    },

    isJSON: function() {
        var str = this;
        if (str.blank()) return false;
        str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
        return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
    },

    evalJSON: function(sanitize) {
        var json = this.unfilterJSON();
        try {
            if (!sanitize || json.isJSON()) return eval('(' + json + ')');
        } catch (e) { }
        throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
    },

    include: function(pattern) {
        return this.indexOf(pattern) > -1;
    },

    startsWith: function(pattern) {
        return this.indexOf(pattern) === 0;
    },

    endsWith: function(pattern) {
        var d = this.length - pattern.length;
        return d >= 0 && this.lastIndexOf(pattern) === d;
    },

    empty: function() {
        return this == '';
    },

    blank: function() {
        return /^\s*$/.test(this);
    },

    interpolate: function(object, pattern) {
        return new Template(this, pattern).evaluate(object);
    }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
    escapeHTML: function() {
        return this.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
    },
    unescapeHTML: function() {
        return this.replace(/&amp;/g, '&').replace(/&lt;/g, '<').replace(/&gt;/g, '>');
    }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
    if (Object.isFunction(replacement)) return replacement;
    var template = new Template(replacement);
    return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
    div: document.createElement('div'),
    text: document.createTextNode('')
});

with (String.prototype.escapeHTML) div.appendChild(text);

var Template = Class.create({
    initialize: function(template, pattern) {
        this.template = template.toString();
        this.pattern = pattern || Template.Pattern;
    },

    evaluate: function(object) {
        if (Object.isFunction(object.toTemplateReplacements))
            object = object.toTemplateReplacements();

        return this.template.gsub(this.pattern, function(match) {
            if (object == null) return '';

            var before = match[1] || '';
            if (before == '\\') return match[2];

            var ctx = object, expr = match[3];
            var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
            match = pattern.exec(expr);
            if (match == null) return before;

            while (match != null) {
                var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
                ctx = ctx[comp];
                if (null == ctx || '' == match[3]) break;
                expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
                match = pattern.exec(expr);
            }

            return before + String.interpret(ctx);
        });
    }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = {};

var Enumerable = {
    each: function(iterator, context) {
        var index = 0;
        iterator = iterator.bind(context);
        try {
            this._each(function(value) {
                iterator(value, index++);
            });
        } catch (e) {
            if (e != $break) throw e;
        }
        return this;
    },

    eachSlice: function(number, iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var index = -number, slices = [], array = this.toArray();
        while ((index += number) < array.length)
            slices.push(array.slice(index, index + number));
        return slices.collect(iterator, context);
    },

    all: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result = true;
        this.each(function(value, index) {
            result = result && !!iterator(value, index);
            if (!result) throw $break;
        });
        return result;
    },

    any: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result = false;
        this.each(function(value, index) {
            if (result = !!iterator(value, index))
                throw $break;
        });
        return result;
    },

    collect: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var results = [];
        this.each(function(value, index) {
            results.push(iterator(value, index));
        });
        return results;
    },

    detect: function(iterator, context) {
        iterator = iterator.bind(context);
        var result;
        this.each(function(value, index) {
            if (iterator(value, index)) {
                result = value;
                throw $break;
            }
        });
        return result;
    },

    findAll: function(iterator, context) {
        iterator = iterator.bind(context);
        var results = [];
        this.each(function(value, index) {
            if (iterator(value, index))
                results.push(value);
        });
        return results;
    },

    grep: function(filter, iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var results = [];

        if (Object.isString(filter))
            filter = new RegExp(filter);

        this.each(function(value, index) {
            if (filter.match(value))
                results.push(iterator(value, index));
        });
        return results;
    },

    include: function(object) {
        if (Object.isFunction(this.indexOf))
            if (this.indexOf(object) != -1) return true;

        var found = false;
        this.each(function(value) {
            if (value == object) {
                found = true;
                throw $break;
            }
        });
        return found;
    },

    inGroupsOf: function(number, fillWith) {
        fillWith = Object.isUndefined(fillWith) ? null : fillWith;
        return this.eachSlice(number, function(slice) {
            while (slice.length < number) slice.push(fillWith);
            return slice;
        });
    },

    inject: function(memo, iterator, context) {
        iterator = iterator.bind(context);
        this.each(function(value, index) {
            memo = iterator(memo, value, index);
        });
        return memo;
    },

    invoke: function(method) {
        var args = $A(arguments).slice(1);
        return this.map(function(value) {
            return value[method].apply(value, args);
        });
    },

    max: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator(value, index);
            if (result == null || value >= result)
                result = value;
        });
        return result;
    },

    min: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var result;
        this.each(function(value, index) {
            value = iterator(value, index);
            if (result == null || value < result)
                result = value;
        });
        return result;
    },

    partition: function(iterator, context) {
        iterator = iterator ? iterator.bind(context) : Prototype.K;
        var trues = [], falses = [];
        this.each(function(value, index) {
            (iterator(value, index) ?
        trues : falses).push(value);
        });
        return [trues, falses];
    },

    pluck: function(property) {
        var results = [];
        this.each(function(value) {
            results.push(value[property]);
        });
        return results;
    },

    reject: function(iterator, context) {
        iterator = iterator.bind(context);
        var results = [];
        this.each(function(value, index) {
            if (!iterator(value, index))
                results.push(value);
        });
        return results;
    },

    sortBy: function(iterator, context) {
        iterator = iterator.bind(context);
        return this.map(function(value, index) {
            return { value: value, criteria: iterator(value, index) };
        }).sort(function(left, right) {
            var a = left.criteria, b = right.criteria;
            return a < b ? -1 : a > b ? 1 : 0;
        }).pluck('value');
    },

    toArray: function() {
        return this.map();
    },

    zip: function() {
        var iterator = Prototype.K, args = $A(arguments);
        if (Object.isFunction(args.last()))
            iterator = args.pop();

        var collections = [this].concat(args).map($A);
        return this.map(function(value, index) {
            return iterator(collections.pluck(index));
        });
    },

    size: function() {
        return this.toArray().length;
    },

    inspect: function() {
        return '#<Enumerable:' + this.toArray().inspect() + '>';
    }
};

Object.extend(Enumerable, {
    map: Enumerable.collect,
    find: Enumerable.detect,
    select: Enumerable.findAll,
    filter: Enumerable.findAll,
    member: Enumerable.include,
    entries: Enumerable.toArray,
    every: Enumerable.all,
    some: Enumerable.any
});
function $A(iterable) {
    if (!iterable) return [];
    if (iterable.toArray) return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
}

if (Prototype.Browser.WebKit) {
    $A = function(iterable) {
        if (!iterable) return [];
        if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
        iterable.toArray) return iterable.toArray();
        var length = iterable.length || 0, results = new Array(length);
        while (length--) results[length] = iterable[length];
        return results;
    };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
    _each: function(iterator) {
        for (var i = 0, length = this.length; i < length; i++)
            iterator(this[i]);
    },

    clear: function() {
        this.length = 0;
        return this;
    },

    first: function() {
        return this[0];
    },

    last: function() {
        return this[this.length - 1];
    },

    compact: function() {
        return this.select(function(value) {
            return value != null;
        });
    },

    flatten: function() {
        return this.inject([], function(array, value) {
            return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
        });
    },

    without: function() {
        var values = $A(arguments);
        return this.select(function(value) {
            return !values.include(value);
        });
    },

    reverse: function(inline) {
        return (inline !== false ? this : this.toArray())._reverse();
    },

    reduce: function() {
        return this.length > 1 ? this : this[0];
    },

    uniq: function(sorted) {
        return this.inject([], function(array, value, index) {
            if (0 == index || (sorted ? array.last() != value : !array.include(value)))
                array.push(value);
            return array;
        });
    },

    intersect: function(array) {
        return this.uniq().findAll(function(item) {
            return array.detect(function(value) { return item === value });
        });
    },

    clone: function() {
        return [].concat(this);
    },

    size: function() {
        return this.length;
    },

    inspect: function() {
        return '[' + this.map(Object.inspect).join(', ') + ']';
    },

    toJSON: function() {
        var results = [];
        this.each(function(object) {
            var value = Object.toJSON(object);
            if (!Object.isUndefined(value)) results.push(value);
        });
        return '[' + results.join(', ') + ']';
    }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
    Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
    i || (i = 0);
    var length = this.length;
    if (i < 0) i = length + i;
    for (; i < length; i++)
        if (this[i] === item) return i;
    return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
    i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
    var n = this.slice(0, i).reverse().indexOf(item);
    return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
    if (!Object.isString(string)) return [];
    string = string.strip();
    return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera) {
    Array.prototype.concat = function() {
        var array = [];
        for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
        for (var i = 0, length = arguments.length; i < length; i++) {
            if (Object.isArray(arguments[i])) {
                for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
                    array.push(arguments[i][j]);
            } else {
                array.push(arguments[i]);
            }
        }
        return array;
    };
}
Object.extend(Number.prototype, {
    toColorPart: function() {
        return this.toPaddedString(2, 16);
    },

    succ: function() {
        return this + 1;
    },

    times: function(iterator) {
        $R(0, this, true).each(iterator);
        return this;
    },

    toPaddedString: function(length, radix) {
        var string = this.toString(radix || 10);
        return '0'.times(length - string.length) + string;
    },

    toJSON: function() {
        return isFinite(this) ? this.toString() : 'null';
    }
});

$w('abs round ceil floor').each(function(method) {
    Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
    return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

    function toQueryPair(key, value) {
        if (Object.isUndefined(value)) return key;
        return key + '=' + encodeURIComponent(String.interpret(value));
    }

    return {
        initialize: function(object) {
            this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
        },

        _each: function(iterator) {
            for (var key in this._object) {
                var value = this._object[key], pair = [key, value];
                pair.key = key;
                pair.value = value;
                iterator(pair);
            }
        },

        set: function(key, value) {
            return this._object[key] = value;
        },

        get: function(key) {
            return this._object[key];
        },

        unset: function(key) {
            var value = this._object[key];
            delete this._object[key];
            return value;
        },

        toObject: function() {
            return Object.clone(this._object);
        },

        keys: function() {
            return this.pluck('key');
        },

        values: function() {
            return this.pluck('value');
        },

        index: function(value) {
            var match = this.detect(function(pair) {
                return pair.value === value;
            });
            return match && match.key;
        },

        merge: function(object) {
            return this.clone().update(object);
        },

        update: function(object) {
            return new Hash(object).inject(this, function(result, pair) {
                result.set(pair.key, pair.value);
                return result;
            });
        },

        toQueryString: function() {
            return this.map(function(pair) {
                var key = encodeURIComponent(pair.key), values = pair.value;

                if (values && typeof values == 'object') {
                    if (Object.isArray(values))
                        return values.map(toQueryPair.curry(key)).join('&');
                }
                return toQueryPair(key, values);
            }).join('&');
        },

        inspect: function() {
            return '#<Hash:{' + this.map(function(pair) {
                return pair.map(Object.inspect).join(': ');
            }).join(', ') + '}>';
        },

        toJSON: function() {
            return Object.toJSON(this.toObject());
        },

        clone: function() {
            return new Hash(this);
        }
    }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
    initialize: function(start, end, exclusive) {
        this.start = start;
        this.end = end;
        this.exclusive = exclusive;
    },

    _each: function(iterator) {
        var value = this.start;
        while (this.include(value)) {
            iterator(value);
            value = value.succ();
        }
    },

    include: function(value) {
        if (value < this.start)
            return false;
        if (this.exclusive)
            return value < this.end;
        return value <= this.end;
    }
});

var $R = function(start, end, exclusive) {
    return new ObjectRange(start, end, exclusive);
};

var Ajax = {
    getTransport: function() {
        return Try.these(
      function() { return new XMLHttpRequest() },
      function() { return new ActiveXObject('Msxml2.XMLHTTP') },
      function() { return new ActiveXObject('Microsoft.XMLHTTP') }
    ) || false;
    },

    activeRequestCount: 0
};

Ajax.Responders = {
    responders: [],

    _each: function(iterator) {
        this.responders._each(iterator);
    },

    register: function(responder) {
        if (!this.include(responder))
            this.responders.push(responder);
    },

    unregister: function(responder) {
        this.responders = this.responders.without(responder);
    },

    dispatch: function(callback, request, transport, json) {
        this.each(function(responder) {
            if (Object.isFunction(responder[callback])) {
                try {
                    responder[callback].apply(responder, [request, transport, json]);
                } catch (e) { }
            }
        });
    }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
    onCreate: function() { Ajax.activeRequestCount++ },
    onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
    initialize: function(options) {
        this.options = {
            method: 'post',
            asynchronous: true,
            contentType: 'application/x-www-form-urlencoded',
            encoding: 'UTF-8',
            parameters: '',
            evalJSON: true,
            evalJS: true
        };
        Object.extend(this.options, options || {});

        this.options.method = this.options.method.toLowerCase();

        if (Object.isString(this.options.parameters))
            this.options.parameters = this.options.parameters.toQueryParams();
        else if (Object.isHash(this.options.parameters))
            this.options.parameters = this.options.parameters.toObject();
    }
});

Ajax.Request = Class.create(Ajax.Base, {
    _complete: false,

    initialize: function($super, url, options) {
        $super(options);
        this.transport = Ajax.getTransport();
        this.request(url);
    },

    request: function(url) {
        this.url = url;
        this.method = this.options.method;
        var params = Object.clone(this.options.parameters);

        if (!['get', 'post'].include(this.method)) {
            // simulate other verbs over post
            params['_method'] = this.method;
            this.method = 'post';
        }

        this.parameters = params;

        if (params = Object.toQueryString(params)) {
            // when GET, append parameters to URL
            if (this.method == 'get')
                this.url += (this.url.include('?') ? '&' : '?') + params;
            else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
                params += '&_=';
        }

        try {
            var response = new Ajax.Response(this);
            if (this.options.onCreate) this.options.onCreate(response);
            Ajax.Responders.dispatch('onCreate', this, response);

            this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

            if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

            this.transport.onreadystatechange = this.onStateChange.bind(this);
            this.setRequestHeaders();

            this.body = this.method == 'post' ? (this.options.postBody || params) : null;
            this.transport.send(this.body);

            /* Force Firefox to handle ready state 4 for synchronous requests */
            if (!this.options.asynchronous && this.transport.overrideMimeType)
                this.onStateChange();

        }
        catch (e) {
            this.dispatchException(e);
        }
    },

    onStateChange: function() {
        var readyState = this.transport.readyState;
        if (readyState > 1 && !((readyState == 4) && this._complete))
            this.respondToReadyState(this.transport.readyState);
    },

    setRequestHeaders: function() {
        var headers = {
            'X-Requested-With': 'XMLHttpRequest',
            'X-Prototype-Version': Prototype.Version,
            'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
        };

        if (this.method == 'post') {
            headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

            /* Force "Connection: close" for older Mozilla browsers to work
            * around a bug where XMLHttpRequest sends an incorrect
            * Content-length header. See Mozilla Bugzilla #246651.
            */
            if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0, 2005])[1] < 2005)
                headers['Connection'] = 'close';
        }

        // user-defined headers
        if (typeof this.options.requestHeaders == 'object') {
            var extras = this.options.requestHeaders;

            if (Object.isFunction(extras.push))
                for (var i = 0, length = extras.length; i < length; i += 2)
                headers[extras[i]] = extras[i + 1];
            else
                $H(extras).each(function(pair) { headers[pair.key] = pair.value });
        }

        for (var name in headers)
            this.transport.setRequestHeader(name, headers[name]);
    },

    success: function() {
        var status = this.getStatus();
        return !status || (status >= 200 && status < 300);
    },

    getStatus: function() {
        try {
            return this.transport.status || 0;
        } catch (e) { return 0 }
    },

    respondToReadyState: function(readyState) {
        var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

        if (state == 'Complete') {
            try {
                this._complete = true;
                (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
            } catch (e) {
                this.dispatchException(e);
            }

            var contentType = response.getHeader('Content-type');
            if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
                this.evalResponse();
        }

        try {
            (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
            Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
        } catch (e) {
            this.dispatchException(e);
        }

        if (state == 'Complete') {
            // avoid memory leak in MSIE: clean up
            this.transport.onreadystatechange = Prototype.emptyFunction;
        }
    },

    isSameOrigin: function() {
        var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
        return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
            protocol: location.protocol,
            domain: document.domain,
            port: location.port ? ':' + location.port : ''
        }));
    },

    getHeader: function(name) {
        try {
            return this.transport.getResponseHeader(name) || null;
        } catch (e) { return null }
    },

    evalResponse: function() {
        try {
            return eval((this.transport.responseText || '').unfilterJSON());
        } catch (e) {
            this.dispatchException(e);
        }
    },

    dispatchException: function(exception) {
        (this.options.onException || Prototype.emptyFunction)(this, exception);
        Ajax.Responders.dispatch('onException', this, exception);
    }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
    initialize: function(request) {
        this.request = request;
        var transport = this.transport = request.transport,
        readyState = this.readyState = transport.readyState;

        if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
            this.status = this.getStatus();
            this.statusText = this.getStatusText();
            this.responseText = String.interpret(transport.responseText);
            this.headerJSON = this._getHeaderJSON();
        }

        if (readyState == 4) {
            var xml = transport.responseXML;
            this.responseXML = Object.isUndefined(xml) ? null : xml;
            this.responseJSON = this._getResponseJSON();
        }
    },

    status: 0,
    statusText: '',

    getStatus: Ajax.Request.prototype.getStatus,

    getStatusText: function() {
        try {
            return this.transport.statusText || '';
        } catch (e) { return '' }
    },

    getHeader: Ajax.Request.prototype.getHeader,

    getAllHeaders: function() {
        try {
            return this.getAllResponseHeaders();
        } catch (e) { return null }
    },

    getResponseHeader: function(name) {
        return this.transport.getResponseHeader(name);
    },

    getAllResponseHeaders: function() {
        return this.transport.getAllResponseHeaders();
    },

    _getHeaderJSON: function() {
        var json = this.getHeader('X-JSON');
        if (!json) return null;
        json = decodeURIComponent(escape(json));
        try {
            return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    },

    _getResponseJSON: function() {
        var options = this.request.options;
        if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
            return null;
        try {
            return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
        } catch (e) {
            this.request.dispatchException(e);
        }
    }
});

Ajax.Updater = Class.create(Ajax.Request, {
    initialize: function($super, container, url, options) {
        this.container = {
            success: (container.success || container),
            failure: (container.failure || (container.success ? null : container))
        };

        options = Object.clone(options);
        var onComplete = options.onComplete;
        options.onComplete = (function(response, json) {
            this.updateContent(response.responseText);
            if (Object.isFunction(onComplete)) onComplete(response, json);
        }).bind(this);

        $super(url, options);
    },

    updateContent: function(responseText) {
        var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

        if (!options.evalScripts) responseText = responseText.stripScripts();

        if (receiver = $(receiver)) {
            if (options.insertion) {
                if (Object.isString(options.insertion)) {
                    var insertion = {}; insertion[options.insertion] = responseText;
                    receiver.insert(insertion);
                }
                else options.insertion(receiver, responseText);
            }
            else receiver.update(responseText);
        }
    }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
    initialize: function($super, container, url, options) {
        $super(options);
        this.onComplete = this.options.onComplete;

        this.frequency = (this.options.frequency || 2);
        this.decay = (this.options.decay || 1);

        this.updater = {};
        this.container = container;
        this.url = url;

        this.start();
    },

    start: function() {
        this.options.onComplete = this.updateComplete.bind(this);
        this.onTimerEvent();
    },

    stop: function() {
        this.updater.options.onComplete = undefined;
        clearTimeout(this.timer);
        (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },

    updateComplete: function(response) {
        if (this.options.decay) {
            this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

            this.lastText = response.responseText;
        }
        this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
    },

    onTimerEvent: function() {
        this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
});
function $(element) {
    if (arguments.length > 1) {
        for (var i = 0, elements = [], length = arguments.length; i < length; i++)
            elements.push($(arguments[i]));
        return elements;
    }
    if (Object.isString(element))
        element = document.getElementById(element);
    return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
    document._getElementsByXPath = function(expression, parentElement) {
        var results = [];
        var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
        for (var i = 0, length = query.snapshotLength; i < length; i++)
            results.push(Element.extend(query.snapshotItem(i)));
        return results;
    };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = {};

if (!Node.ELEMENT_NODE) {
    // DOM level 2 ECMAScript Language Binding
    Object.extend(Node, {
        ELEMENT_NODE: 1,
        ATTRIBUTE_NODE: 2,
        TEXT_NODE: 3,
        CDATA_SECTION_NODE: 4,
        ENTITY_REFERENCE_NODE: 5,
        ENTITY_NODE: 6,
        PROCESSING_INSTRUCTION_NODE: 7,
        COMMENT_NODE: 8,
        DOCUMENT_NODE: 9,
        DOCUMENT_TYPE_NODE: 10,
        DOCUMENT_FRAGMENT_NODE: 11,
        NOTATION_NODE: 12
    });
}

(function() {
    var element = this.Element;
    this.Element = function(tagName, attributes) {
        attributes = attributes || {};
        tagName = tagName.toLowerCase();
        var cache = Element.cache;
        if (Prototype.Browser.IE && attributes.name) {
            tagName = '<' + tagName + ' name="' + attributes.name + '">';
            delete attributes.name;
            return Element.writeAttribute(document.createElement(tagName), attributes);
        }
        if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
        return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
    };
    Object.extend(this.Element, element || {});
}).call(window);

Element.cache = {};

Element.Methods = {
    visible: function(element) {
        return $(element).style.display != 'none';
    },

    toggle: function(element) {
        element = $(element);
        Element[Element.visible(element) ? 'hide' : 'show'](element);
        return element;
    },

    hide: function(element) {
        $(element).style.display = 'none';
        return element;
    },

    show: function(element) {
        $(element).style.display = '';
        return element;
    },

    remove: function(element) {
        element = $(element);
        element.parentNode.removeChild(element);
        return element;
    },

    update: function(element, content) {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) return element.update().insert(content);
        content = Object.toHTML(content);
        element.innerHTML = content.stripScripts();
        content.evalScripts.bind(content).defer();
        return element;
    },

    replace: function(element, content) {
        element = $(element);
        if (content && content.toElement) content = content.toElement();
        else if (!Object.isElement(content)) {
            content = Object.toHTML(content);
            var range = element.ownerDocument.createRange();
            range.selectNode(element);
            content.evalScripts.bind(content).defer();
            content = range.createContextualFragment(content.stripScripts());
        }
        element.parentNode.replaceChild(content, element);
        return element;
    },

    insert: function(element, insertions) {
        element = $(element);

        if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
            insertions = { bottom: insertions };

        var content, insert, tagName, childNodes;

        for (var position in insertions) {
            content = insertions[position];
            position = position.toLowerCase();
            insert = Element._insertionTranslations[position];

            if (content && content.toElement) content = content.toElement();
            if (Object.isElement(content)) {
                insert(element, content);
                continue;
            }

            content = Object.toHTML(content);

            tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

            childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

            if (position == 'top' || position == 'after') childNodes.reverse();
            childNodes.each(insert.curry(element));

            content.evalScripts.bind(content).defer();
        }

        return element;
    },

    wrap: function(element, wrapper, attributes) {
        element = $(element);
        if (Object.isElement(wrapper))
            $(wrapper).writeAttribute(attributes || {});
        else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
        else wrapper = new Element('div', wrapper);
        if (element.parentNode)
            element.parentNode.replaceChild(wrapper, element);
        wrapper.appendChild(element);
        return wrapper;
    },

    inspect: function(element) {
        element = $(element);
        var result = '<' + element.tagName.toLowerCase();
        $H({ 'id': 'id', 'className': 'class' }).each(function(pair) {
            var property = pair.first(), attribute = pair.last();
            var value = (element[property] || '').toString();
            if (value) result += ' ' + attribute + '=' + value.inspect(true);
        });
        return result + '>';
    },

    recursivelyCollect: function(element, property) {
        element = $(element);
        var elements = [];
        while (element = element[property])
            if (element.nodeType == 1)
            elements.push(Element.extend(element));
        return elements;
    },

    ancestors: function(element) {
        return $(element).recursivelyCollect('parentNode');
    },

    descendants: function(element) {
        return $(element).select("*");
    },

    firstDescendant: function(element) {
        element = $(element).firstChild;
        while (element && element.nodeType != 1) element = element.nextSibling;
        return $(element);
    },

    immediateDescendants: function(element) {
        if (!(element = $(element).firstChild)) return [];
        while (element && element.nodeType != 1) element = element.nextSibling;
        if (element) return [element].concat($(element).nextSiblings());
        return [];
    },

    previousSiblings: function(element) {
        return $(element).recursivelyCollect('previousSibling');
    },

    nextSiblings: function(element) {
        return $(element).recursivelyCollect('nextSibling');
    },

    siblings: function(element) {
        element = $(element);
        return element.previousSiblings().reverse().concat(element.nextSiblings());
    },

    match: function(element, selector) {
        if (Object.isString(selector))
            selector = new Selector(selector);
        return selector.match($(element));
    },

    up: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(element.parentNode);
        var ancestors = element.ancestors();
        return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
    },

    down: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return element.firstDescendant();
        return Object.isNumber(expression) ? element.descendants()[expression] :
      element.select(expression)[index || 0];
    },

    previous: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
        var previousSiblings = element.previousSiblings();
        return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
    },

    next: function(element, expression, index) {
        element = $(element);
        if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
        var nextSiblings = element.nextSiblings();
        return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
    },

    select: function() {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element, args);
    },

    adjacent: function() {
        var args = $A(arguments), element = $(args.shift());
        return Selector.findChildElements(element.parentNode, args).without(element);
    },

    identify: function(element) {
        element = $(element);
        var id = element.readAttribute('id'), self = arguments.callee;
        if (id) return id;
        do { id = 'anonymous_element_' + self.counter++ } while ($(id));
        element.writeAttribute('id', id);
        return id;
    },

    readAttribute: function(element, name) {
        element = $(element);
        if (Prototype.Browser.IE) {
            var t = Element._attributeTranslations.read;
            if (t.values[name]) return t.values[name](element, name);
            if (t.names[name]) name = t.names[name];
            if (name.include(':')) {
                return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
            }
        }
        return element.getAttribute(name);
    },

    writeAttribute: function(element, name, value) {
        element = $(element);
        var attributes = {}, t = Element._attributeTranslations.write;

        if (typeof name == 'object') attributes = name;
        else attributes[name] = Object.isUndefined(value) ? true : value;

        for (var attr in attributes) {
            name = t.names[attr] || attr;
            value = attributes[attr];
            if (t.values[attr]) name = t.values[attr](element, value);
            if (value === false || value === null)
                element.removeAttribute(name);
            else if (value === true)
                element.setAttribute(name, name);
            else element.setAttribute(name, value);
        }
        return element;
    },

    getHeight: function(element) {
        return $(element).getDimensions().height;
    },

    getWidth: function(element) {
        return $(element).getDimensions().width;
    },

    classNames: function(element) {
        return new Element.ClassNames(element);
    },

    hasClassName: function(element, className) {
        if (!(element = $(element))) return;
        var elementClassName = element.className;
        return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
    },

    addClassName: function(element, className) {
        if (!(element = $(element))) return;
        if (!element.hasClassName(className))
            element.className += (element.className ? ' ' : '') + className;
        return element;
    },

    removeClassName: function(element, className) {
        if (!(element = $(element))) return;
        element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
        return element;
    },

    toggleClassName: function(element, className) {
        if (!(element = $(element))) return;
        return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
    },

    // removes whitespace-only text node children
    cleanWhitespace: function(element) {
        element = $(element);
        var node = element.firstChild;
        while (node) {
            var nextNode = node.nextSibling;
            if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
                element.removeChild(node);
            node = nextNode;
        }
        return element;
    },

    empty: function(element) {
        return $(element).innerHTML.blank();
    },

    descendantOf: function(element, ancestor) {
        element = $(element), ancestor = $(ancestor);
        var originalAncestor = ancestor;

        if (element.compareDocumentPosition)
            return (element.compareDocumentPosition(ancestor) & 8) === 8;

        if (element.sourceIndex && !Prototype.Browser.Opera) {
            var e = element.sourceIndex, a = ancestor.sourceIndex,
       nextAncestor = ancestor.nextSibling;
            if (!nextAncestor) {
                do { ancestor = ancestor.parentNode; }
                while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
            }
            if (nextAncestor && nextAncestor.sourceIndex)
                return (e > a && e < nextAncestor.sourceIndex);
        }

        while (element = element.parentNode)
            if (element == originalAncestor) return true;
        return false;
    },

    scrollTo: function(element) {
        element = $(element);
        var pos = element.cumulativeOffset();
        window.scrollTo(pos[0], pos[1]);
        return element;
    },

    getStyle: function(element, style) {
        element = $(element);
        style = style == 'float' ? 'cssFloat' : style.camelize();
        var value = element.style[style];
        if (!value) {
            var css = document.defaultView.getComputedStyle(element, null);
            value = css ? css[style] : null;
        }
        if (style == 'opacity') return value ? parseFloat(value) : 1.0;
        return value == 'auto' ? null : value;
    },

    getOpacity: function(element) {
        return $(element).getStyle('opacity');
    },

    setStyle: function(element, styles) {
        element = $(element);
        var elementStyle = element.style, match;
        if (Object.isString(styles)) {
            element.style.cssText += ';' + styles;
            return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
        }
        for (var property in styles)
            if (property == 'opacity') element.setOpacity(styles[property]);
        else
            elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

        return element;
    },

    setOpacity: function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
        return element;
    },

    getDimensions: function(element) {
        element = $(element);
        var display = $(element).getStyle('display');
        if (display != 'none' && display != null) // Safari bug
            return { width: element.offsetWidth, height: element.offsetHeight };

        // All *Width and *Height properties give 0 on elements with display none,
        // so enable the element temporarily
        var els = element.style;
        var originalVisibility = els.visibility;
        var originalPosition = els.position;
        var originalDisplay = els.display;
        els.visibility = 'hidden';
        els.position = 'absolute';
        els.display = 'block';
        var originalWidth = element.clientWidth;
        var originalHeight = element.clientHeight;
        els.display = originalDisplay;
        els.position = originalPosition;
        els.visibility = originalVisibility;
        return { width: originalWidth, height: originalHeight };
    },

    makePositioned: function(element) {
        element = $(element);
        var pos = Element.getStyle(element, 'position');
        if (pos == 'static' || !pos) {
            element._madePositioned = true;
            element.style.position = 'relative';
            // Opera returns the offset relative to the positioning context, when an
            // element is position relative but top and left have not been defined
            if (window.opera) {
                element.style.top = 0;
                element.style.left = 0;
            }
        }
        return element;
    },

    undoPositioned: function(element) {
        element = $(element);
        if (element._madePositioned) {
            element._madePositioned = undefined;
            element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
        }
        return element;
    },

    makeClipping: function(element) {
        element = $(element);
        if (element._overflow) return element;
        element._overflow = Element.getStyle(element, 'overflow') || 'auto';
        if (element._overflow !== 'hidden')
            element.style.overflow = 'hidden';
        return element;
    },

    undoClipping: function(element) {
        element = $(element);
        if (!element._overflow) return element;
        element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
        element._overflow = null;
        return element;
    },

    cumulativeOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
        } while (element);
        return Element._returnOffset(valueL, valueT);
    },

    positionedOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            if (element) {
                if (element.tagName == 'BODY') break;
                var p = Element.getStyle(element, 'position');
                if (p !== 'static') break;
            }
        } while (element);
        return Element._returnOffset(valueL, valueT);
    },

    absolutize: function(element) {
        element = $(element);
        if (element.getStyle('position') == 'absolute') return;
        // Position.prepare(); // To be done manually by Scripty when it needs it.

        var offsets = element.positionedOffset();
        var top = offsets[1];
        var left = offsets[0];
        var width = element.clientWidth;
        var height = element.clientHeight;

        element._originalLeft = left - parseFloat(element.style.left || 0);
        element._originalTop = top - parseFloat(element.style.top || 0);
        element._originalWidth = element.style.width;
        element._originalHeight = element.style.height;

        element.style.position = 'absolute';
        element.style.top = top + 'px';
        element.style.left = left + 'px';
        element.style.width = width + 'px';
        element.style.height = height + 'px';
        return element;
    },

    relativize: function(element) {
        element = $(element);
        if (element.getStyle('position') == 'relative') return;
        // Position.prepare(); // To be done manually by Scripty when it needs it.

        element.style.position = 'relative';
        var top = parseFloat(element.style.top || 0) - (element._originalTop || 0);
        var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

        element.style.top = top + 'px';
        element.style.left = left + 'px';
        element.style.height = element._originalHeight;
        element.style.width = element._originalWidth;
        return element;
    },

    cumulativeScrollOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.scrollTop || 0;
            valueL += element.scrollLeft || 0;
            element = element.parentNode;
        } while (element);
        return Element._returnOffset(valueL, valueT);
    },

    getOffsetParent: function(element) {
        if (element.offsetParent) return $(element.offsetParent);
        if (element == document.body) return $(element);

        while ((element = element.parentNode) && element != document.body)
            if (Element.getStyle(element, 'position') != 'static')
            return $(element);

        return $(document.body);
    },

    viewportOffset: function(forElement) {
        var valueT = 0, valueL = 0;

        var element = forElement;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;

            // Safari fix
            if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

        } while (element = element.offsetParent);

        element = forElement;
        do {
            if (!Prototype.Browser.Opera || element.tagName == 'BODY') {
                valueT -= element.scrollTop || 0;
                valueL -= element.scrollLeft || 0;
            }
        } while (element = element.parentNode);

        return Element._returnOffset(valueL, valueT);
    },

    clonePosition: function(element, source) {
        var options = Object.extend({
            setLeft: true,
            setTop: true,
            setWidth: true,
            setHeight: true,
            offsetTop: 0,
            offsetLeft: 0
        }, arguments[2] || {});

        // find page position of source
        source = $(source);
        var p = source.viewportOffset();

        // find coordinate system to use
        element = $(element);
        var delta = [0, 0];
        var parent = null;
        // delta [0,0] will do fine with position: fixed elements,
        // position:absolute needs offsetParent deltas
        if (Element.getStyle(element, 'position') == 'absolute') {
            parent = element.getOffsetParent();
            delta = parent.viewportOffset();
        }

        // correct by body offsets (fixes Safari)
        if (parent == document.body) {
            delta[0] -= document.body.offsetLeft;
            delta[1] -= document.body.offsetTop;
        }

        // set position
        if (options.setLeft) element.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
        if (options.setTop) element.style.top = (p[1] - delta[1] + options.offsetTop) + 'px';
        if (options.setWidth) element.style.width = source.offsetWidth + 'px';
        if (options.setHeight) element.style.height = source.offsetHeight + 'px';
        return element;
    }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
    getElementsBySelector: Element.Methods.select,
    childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
    write: {
        names: {
            className: 'class',
            htmlFor: 'for'
        },
        values: {}
    }
};

if (Prototype.Browser.Opera) {
    Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
        switch (style) {
            case 'left': case 'top': case 'right': case 'bottom':
                if (proceed(element, 'position') === 'static') return null;
            case 'height': case 'width':
                // returns '0px' for hidden elements; we want it to return null
                if (!Element.visible(element)) return null;

                // returns the border-box dimensions rather than the content-box
                // dimensions, so we subtract padding and borders from the value
                var dim = parseInt(proceed(element, style), 10);

                if (dim !== element['offset' + style.capitalize()])
                    return dim + 'px';

                var properties;
                if (style === 'height') {
                    properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
                }
                else {
                    properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
                }
                return properties.inject(dim, function(memo, property) {
                    var val = proceed(element, property);
                    return val === null ? memo : memo - parseInt(val, 10);
                }) + 'px';
            default: return proceed(element, style);
        }
    }
  );

    Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
        if (attribute === 'title') return element.title;
        return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
    // IE doesn't report offsets correctly for static elements, so we change them
    // to "relative" to get the values, then change them back.
    Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
        element = $(element);
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
    }
  );

    $w('positionedOffset viewportOffset').each(function(method) {
        Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
          element = $(element);
          var position = element.getStyle('position');
          if (position !== 'static') return proceed(element);
          // Trigger hasLayout on the offset parent so that IE6 reports
          // accurate offsetTop and offsetLeft values for position: fixed.
          var offsetParent = element.getOffsetParent();
          if (offsetParent && offsetParent.getStyle('position') === 'fixed')
              offsetParent.setStyle({ zoom: 1 });
          element.setStyle({ position: 'relative' });
          var value = proceed(element);
          element.setStyle({ position: position });
          return value;
      }
    );
    });

    Element.Methods.getStyle = function(element, style) {
        element = $(element);
        style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
        var value = element.style[style];
        if (!value && element.currentStyle) value = element.currentStyle[style];

        if (style == 'opacity') {
            if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
                if (value[1]) return parseFloat(value[1]) / 100;
            return 1.0;
        }

        if (value == 'auto') {
            if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
                return element['offset' + style.capitalize()] + 'px';
            return null;
        }
        return value;
    };

    Element.Methods.setOpacity = function(element, value) {
        function stripAlpha(filter) {
            return filter.replace(/alpha\([^\)]*\)/gi, '');
        }
        element = $(element);
        var currentStyle = element.currentStyle;
        if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
            element.style.zoom = 1;

        var filter = element.getStyle('filter'), style = element.style;
        if (value == 1 || value === '') {
            (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
            return element;
        } else if (value < 0.00001) value = 0;
        style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
        return element;
    };

    Element._attributeTranslations = {
        read: {
            names: {
                'class': 'className',
                'for': 'htmlFor'
            },
            values: {
                _getAttr: function(element, attribute) {
                    return element.getAttribute(attribute, 2);
                },
                _getAttrNode: function(element, attribute) {
                    var node = element.getAttributeNode(attribute);
                    return node ? node.value : "";
                },
                _getEv: function(element, attribute) {
                    attribute = element.getAttribute(attribute);
                    return attribute ? attribute.toString().slice(23, -2) : null;
                },
                _flag: function(element, attribute) {
                    return $(element).hasAttribute(attribute) ? attribute : null;
                },
                style: function(element) {
                    return element.style.cssText.toLowerCase();
                },
                title: function(element) {
                    return element.title;
                }
            }
        }
    };

    Element._attributeTranslations.write = {
        names: Object.extend({
            cellpadding: 'cellPadding',
            cellspacing: 'cellSpacing'
        }, Element._attributeTranslations.read.names),
        values: {
            checked: function(element, value) {
                element.checked = !!value;
            },

            style: function(element, value) {
                element.style.cssText = value ? value : '';
            }
        }
    };

    Element._attributeTranslations.has = {};

    $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc').each(function(attr) {
          Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
          Element._attributeTranslations.has[attr.toLowerCase()] = attr;
      });

    (function(v) {
        Object.extend(v, {
            href: v._getAttr,
            src: v._getAttr,
            type: v._getAttr,
            action: v._getAttrNode,
            disabled: v._flag,
            checked: v._flag,
            readonly: v._flag,
            multiple: v._flag,
            onload: v._getEv,
            onunload: v._getEv,
            onclick: v._getEv,
            ondblclick: v._getEv,
            onmousedown: v._getEv,
            onmouseup: v._getEv,
            onmouseover: v._getEv,
            onmousemove: v._getEv,
            onmouseout: v._getEv,
            onfocus: v._getEv,
            onblur: v._getEv,
            onkeypress: v._getEv,
            onkeydown: v._getEv,
            onkeyup: v._getEv,
            onsubmit: v._getEv,
            onreset: v._getEv,
            onselect: v._getEv,
            onchange: v._getEv
        });
    })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
    Element.Methods.setOpacity = function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
        return element;
    };
}

else if (Prototype.Browser.WebKit) {
    Element.Methods.setOpacity = function(element, value) {
        element = $(element);
        element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

        if (value == 1)
            if (element.tagName == 'IMG' && element.width) {
            element.width++; element.width--;
        } else try {
            var n = document.createTextNode(' ');
            element.appendChild(n);
            element.removeChild(n);
        } catch (e) { }

        return element;
    };

    // Safari returns margins on body which is incorrect if the child is absolutely
    // positioned.  For performance reasons, redefine Element#cumulativeOffset for
    // KHTML/WebKit only.
    Element.Methods.cumulativeOffset = function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            if (element.offsetParent == document.body)
                if (Element.getStyle(element, 'position') == 'absolute') break;

            element = element.offsetParent;
        } while (element);

        return Element._returnOffset(valueL, valueT);
    };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
    // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
    Element.Methods.update = function(element, content) {
        element = $(element);

        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) return element.update().insert(content);

        content = Object.toHTML(content);
        var tagName = element.tagName.toUpperCase();

        if (tagName in Element._insertionTranslations.tags) {
            $A(element.childNodes).each(function(node) { element.removeChild(node) });
            Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
        }
        else element.innerHTML = content.stripScripts();

        content.evalScripts.bind(content).defer();
        return element;
    };
}

if ('outerHTML' in document.createElement('div')) {
    Element.Methods.replace = function(element, content) {
        element = $(element);

        if (content && content.toElement) content = content.toElement();
        if (Object.isElement(content)) {
            element.parentNode.replaceChild(content, element);
            return element;
        }

        content = Object.toHTML(content);
        var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

        if (Element._insertionTranslations.tags[tagName]) {
            var nextSibling = element.next();
            var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
            parent.removeChild(element);
            if (nextSibling)
                fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
            else
                fragments.each(function(node) { parent.appendChild(node) });
        }
        else element.outerHTML = content.stripScripts();

        content.evalScripts.bind(content).defer();
        return element;
    };
}

Element._returnOffset = function(l, t) {
    var result = [l, t];
    result.left = l;
    result.top = t;
    return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
    var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
    if (t) {
        div.innerHTML = t[0] + html + t[1];
        t[2].times(function() { div = div.firstChild });
    } else div.innerHTML = html;
    return $A(div.childNodes);
};

Element._insertionTranslations = {
    before: function(element, node) {
        element.parentNode.insertBefore(node, element);
    },
    top: function(element, node) {
        element.insertBefore(node, element.firstChild);
    },
    bottom: function(element, node) {
        element.appendChild(node);
    },
    after: function(element, node) {
        element.parentNode.insertBefore(node, element.nextSibling);
    },
    tags: {
        TABLE: ['<table>', '</table>', 1],
        TBODY: ['<table><tbody>', '</tbody></table>', 2],
        TR: ['<table><tbody><tr>', '</tr></tbody></table>', 3],
        TD: ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
        SELECT: ['<select>', '</select>', 1]
    }
};

(function() {
    Object.extend(this.tags, {
        THEAD: this.tags.TBODY,
        TFOOT: this.tags.TBODY,
        TH: this.tags.TD
    });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
    hasAttribute: function(element, attribute) {
        attribute = Element._attributeTranslations.has[attribute] || attribute;
        var node = $(element).getAttributeNode(attribute);
        return node && node.specified;
    }
};

Element.Methods.ByTag = {};

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div').__proto__) {
    window.HTMLElement = {};
    window.HTMLElement.prototype = document.createElement('div').__proto__;
    Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
    if (Prototype.BrowserFeatures.SpecificElementExtensions)
        return Prototype.K;

    var Methods = {}, ByTag = Element.Methods.ByTag;

    var extend = Object.extend(function(element) {
        if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

        var methods = Object.clone(Methods),
      tagName = element.tagName, property, value;

        // extend methods for specific tags
        if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

        for (property in methods) {
            value = methods[property];
            if (Object.isFunction(value) && !(property in element))
                element[property] = value.methodize();
        }

        element._extendedByPrototype = Prototype.emptyFunction;
        return element;

    }, {
        refresh: function() {
            // extend methods for all tags (Safari doesn't need this)
            if (!Prototype.BrowserFeatures.ElementExtensions) {
                Object.extend(Methods, Element.Methods);
                Object.extend(Methods, Element.Methods.Simulated);
            }
        }
    });

    extend.refresh();
    return extend;
})();

Element.hasAttribute = function(element, attribute) {
    if (element.hasAttribute) return element.hasAttribute(attribute);
    return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
    var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

    if (!methods) {
        Object.extend(Form, Form.Methods);
        Object.extend(Form.Element, Form.Element.Methods);
        Object.extend(Element.Methods.ByTag, {
            "FORM": Object.clone(Form.Methods),
            "INPUT": Object.clone(Form.Element.Methods),
            "SELECT": Object.clone(Form.Element.Methods),
            "TEXTAREA": Object.clone(Form.Element.Methods)
        });
    }

    if (arguments.length == 2) {
        var tagName = methods;
        methods = arguments[1];
    }

    if (!tagName) Object.extend(Element.Methods, methods || {});
    else {
        if (Object.isArray(tagName)) tagName.each(extend);
        else extend(tagName);
    }

    function extend(tagName) {
        tagName = tagName.toUpperCase();
        if (!Element.Methods.ByTag[tagName])
            Element.Methods.ByTag[tagName] = {};
        Object.extend(Element.Methods.ByTag[tagName], methods);
    }

    function copy(methods, destination, onlyIfAbsent) {
        onlyIfAbsent = onlyIfAbsent || false;
        for (var property in methods) {
            var value = methods[property];
            if (!Object.isFunction(value)) continue;
            if (!onlyIfAbsent || !(property in destination))
                destination[property] = value.methodize();
        }
    }

    function findDOMClass(tagName) {
        var klass;
        var trans = {
            "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
            "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
            "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
            "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
            "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
        };
        if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName + 'Element';
        if (window[klass]) return window[klass];
        klass = 'HTML' + tagName.capitalize() + 'Element';
        if (window[klass]) return window[klass];

        window[klass] = {};
        window[klass].prototype = document.createElement(tagName).__proto__;
        return window[klass];
    }

    if (F.ElementExtensions) {
        copy(Element.Methods, HTMLElement.prototype);
        copy(Element.Methods.Simulated, HTMLElement.prototype, true);
    }

    if (F.SpecificElementExtensions) {
        for (var tag in Element.Methods.ByTag) {
            var klass = findDOMClass(tag);
            if (Object.isUndefined(klass)) continue;
            copy(T[tag], klass.prototype);
        }
    }

    Object.extend(Element, Element.Methods);
    delete Element.ByTag;

    if (Element.extend.refresh) Element.extend.refresh();
    Element.cache = {};
};

document.viewport = {
    getDimensions: function() {
        var dimensions = {};
        var B = Prototype.Browser;
        $w('width height').each(function(d) {
            var D = d.capitalize();
            dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
        (B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
        });
        return dimensions;
    },

    getWidth: function() {
        return this.getDimensions().width;
    },

    getHeight: function() {
        return this.getDimensions().height;
    },

    getScrollOffsets: function() {
        return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
    }
};
/* Portions of the Selector class are derived from Jack Slocum’s DomQuery,
* part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
* license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
    initialize: function(expression) {
        this.expression = expression.strip();
        this.compileMatcher();
    },

    shouldUseXPath: function() {
        if (!Prototype.BrowserFeatures.XPath) return false;

        var e = this.expression;

        // Safari 3 chokes on :*-of-type and :empty
        if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
            return false;

        // XPath can't do namespaced attributes, nor can it read
        // the "checked" property from DOM nodes
        if ((/(\[[\w-]*?:|:checked)/).test(this.expression))
            return false;

        return true;
    },

    compileMatcher: function() {
        if (this.shouldUseXPath())
            return this.compileXPathMatcher();

        var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

        if (Selector._cache[e]) {
            this.matcher = Selector._cache[e];
            return;
        }

        this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

        while (e && le != e && (/\S/).test(e)) {
            le = e;
            for (var i in ps) {
                p = ps[i];
                if (m = e.match(p)) {
                    this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
    	      new Template(c[i]).evaluate(m));
                    e = e.replace(m[0], '');
                    break;
                }
            }
        }

        this.matcher.push("return h.unique(n);\n}");
        eval(this.matcher.join('\n'));
        Selector._cache[this.expression] = this.matcher;
    },

    compileXPathMatcher: function() {
        var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

        if (Selector._cache[e]) {
            this.xpath = Selector._cache[e]; return;
        }

        this.matcher = ['.//*'];
        while (e && le != e && (/\S/).test(e)) {
            le = e;
            for (var i in ps) {
                if (m = e.match(ps[i])) {
                    this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
                    e = e.replace(m[0], '');
                    break;
                }
            }
        }

        this.xpath = this.matcher.join('');
        Selector._cache[this.expression] = this.xpath;
    },

    findElements: function(root) {
        root = root || document;
        if (this.xpath) return document._getElementsByXPath(this.xpath, root);
        return this.matcher(root);
    },

    match: function(element) {
        this.tokens = [];

        var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
        var le, p, m;

        while (e && le !== e && (/\S/).test(e)) {
            le = e;
            for (var i in ps) {
                p = ps[i];
                if (m = e.match(p)) {
                    // use the Selector.assertions methods unless the selector
                    // is too complex.
                    if (as[i]) {
                        this.tokens.push([i, Object.clone(m)]);
                        e = e.replace(m[0], '');
                    } else {
                        // reluctantly do a document-wide search
                        // and look for a match in the array
                        return this.findElements(document).include(element);
                    }
                }
            }
        }

        var match = true, name, matches;
        for (var i = 0, token; token = this.tokens[i]; i++) {
            name = token[0], matches = token[1];
            if (!Selector.assertions[name](element, matches)) {
                match = false; break;
            }
        }

        return match;
    },

    toString: function() {
        return this.expression;
    },

    inspect: function() {
        return "#<Selector:" + this.expression.inspect() + ">";
    }
});

Object.extend(Selector, {
    _cache: {},

    xpath: {
        descendant: "//*",
        child: "/*",
        adjacent: "/following-sibling::*[1]",
        laterSibling: '/following-sibling::*',
        tagName: function(m) {
            if (m[1] == '*') return '';
            return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
        },
        className: "[contains(concat(' ', @class, ' '), ' #{1} ')]",
        id: "[@id='#{1}']",
        attrPresence: function(m) {
            m[1] = m[1].toLowerCase();
            return new Template("[@#{1}]").evaluate(m);
        },
        attr: function(m) {
            m[1] = m[1].toLowerCase();
            m[3] = m[5] || m[6];
            return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
        },
        pseudo: function(m) {
            var h = Selector.xpath.pseudos[m[1]];
            if (!h) return '';
            if (Object.isFunction(h)) return h(m);
            return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
        },
        operators: {
            '=': "[@#{1}='#{3}']",
            '!=': "[@#{1}!='#{3}']",
            '^=': "[starts-with(@#{1}, '#{3}')]",
            '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
            '*=': "[contains(@#{1}, '#{3}')]",
            '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
            '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
        },
        pseudos: {
            'first-child': '[not(preceding-sibling::*)]',
            'last-child': '[not(following-sibling::*)]',
            'only-child': '[not(preceding-sibling::* or following-sibling::*)]',
            'empty': "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
            'checked': "[@checked]",
            'disabled': "[@disabled]",
            'enabled': "[not(@disabled)]",
            'not': function(m) {
                var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

                var exclusion = [];
                while (e && le != e && (/\S/).test(e)) {
                    le = e;
                    for (var i in p) {
                        if (m = e.match(p[i])) {
                            v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
                            exclusion.push("(" + v.substring(1, v.length - 1) + ")");
                            e = e.replace(m[0], '');
                            break;
                        }
                    }
                }
                return "[not(" + exclusion.join(" and ") + ")]";
            },
            'nth-child': function(m) {
                return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
            },
            'nth-last-child': function(m) {
                return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
            },
            'nth-of-type': function(m) {
                return Selector.xpath.pseudos.nth("position() ", m);
            },
            'nth-last-of-type': function(m) {
                return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
            },
            'first-of-type': function(m) {
                m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
            },
            'last-of-type': function(m) {
                m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
            },
            'only-of-type': function(m) {
                var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
            },
            nth: function(fragment, m) {
                var mm, formula = m[6], predicate;
                if (formula == 'even') formula = '2n+0';
                if (formula == 'odd') formula = '2n+1';
                if (mm = formula.match(/^(\d+)$/)) // digit only
                    return '[' + fragment + "= " + mm[1] + ']';
                if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
                    if (mm[1] == "-") mm[1] = -1;
                    var a = mm[1] ? Number(mm[1]) : 1;
                    var b = mm[2] ? Number(mm[2]) : 0;
                    predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
                    return new Template(predicate).evaluate({
                        fragment: fragment, a: a, b: b
                    });
                }
            }
        }
    },

    criteria: {
        tagName: 'n = h.tagName(n, r, "#{1}", c);      c = false;',
        className: 'n = h.className(n, r, "#{1}", c);    c = false;',
        id: 'n = h.id(n, r, "#{1}", c);           c = false;',
        attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
        attr: function(m) {
            m[3] = (m[5] || m[6]);
            return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
        },
        pseudo: function(m) {
            if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
            return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
        },
        descendant: 'c = "descendant";',
        child: 'c = "child";',
        adjacent: 'c = "adjacent";',
        laterSibling: 'c = "laterSibling";'
    },

    patterns: {
        // combinators must be listed first
        // (and descendant needs to be last combinator)
        laterSibling: /^\s*~\s*/,
        child: /^\s*>\s*/,
        adjacent: /^\s*\+\s*/,
        descendant: /^\s/,

        // selectors follow
        tagName: /^\s*(\*|[\w\-]+)(\b|$)?/,
        id: /^#([\w\-\*]+)(\b|$)/,
        className: /^\.([\w\-\*]+)(\b|$)/,
        pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
        attrPresence: /^\[([\w]+)\]/,
        attr: /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
    },

    // for Selector.match and Element#match
    assertions: {
        tagName: function(element, matches) {
            return matches[1].toUpperCase() == element.tagName.toUpperCase();
        },

        className: function(element, matches) {
            return Element.hasClassName(element, matches[1]);
        },

        id: function(element, matches) {
            return element.id === matches[1];
        },

        attrPresence: function(element, matches) {
            return Element.hasAttribute(element, matches[1]);
        },

        attr: function(element, matches) {
            var nodeValue = Element.readAttribute(element, matches[1]);
            return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
        }
    },

    handlers: {
        // UTILITY FUNCTIONS
        // joins two collections
        concat: function(a, b) {
            for (var i = 0, node; node = b[i]; i++)
                a.push(node);
            return a;
        },

        // marks an array of nodes for counting
        mark: function(nodes) {
            var _true = Prototype.emptyFunction;
            for (var i = 0, node; node = nodes[i]; i++)
                node._countedByPrototype = _true;
            return nodes;
        },

        unmark: function(nodes) {
            for (var i = 0, node; node = nodes[i]; i++)
                node._countedByPrototype = undefined;
            return nodes;
        },

        // mark each child node with its position (for nth calls)
        // "ofType" flag indicates whether we're indexing for nth-of-type
        // rather than nth-child
        index: function(parentNode, reverse, ofType) {
            parentNode._countedByPrototype = Prototype.emptyFunction;
            if (reverse) {
                for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
                    var node = nodes[i];
                    if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
                }
            } else {
                for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
                    if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
            }
        },

        // filters out duplicates and extends all nodes
        unique: function(nodes) {
            if (nodes.length == 0) return nodes;
            var results = [], n;
            for (var i = 0, l = nodes.length; i < l; i++)
                if (!(n = nodes[i])._countedByPrototype) {
                n._countedByPrototype = Prototype.emptyFunction;
                results.push(Element.extend(n));
            }
            return Selector.handlers.unmark(results);
        },

        // COMBINATOR FUNCTIONS
        descendant: function(nodes) {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                h.concat(results, node.getElementsByTagName('*'));
            return results;
        },

        child: function(nodes) {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                for (var j = 0, child; child = node.childNodes[j]; j++)
                    if (child.nodeType == 1 && child.tagName != '!') results.push(child);
            }
            return results;
        },

        adjacent: function(nodes) {
            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                var next = this.nextElementSibling(node);
                if (next) results.push(next);
            }
            return results;
        },

        laterSibling: function(nodes) {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                h.concat(results, Element.nextSiblings(node));
            return results;
        },

        nextElementSibling: function(node) {
            while (node = node.nextSibling)
                if (node.nodeType == 1) return node;
            return null;
        },

        previousElementSibling: function(node) {
            while (node = node.previousSibling)
                if (node.nodeType == 1) return node;
            return null;
        },

        // TOKEN FUNCTIONS
        tagName: function(nodes, root, tagName, combinator) {
            var uTagName = tagName.toUpperCase();
            var results = [], h = Selector.handlers;
            if (nodes) {
                if (combinator) {
                    // fastlane for ordinary descendant combinators
                    if (combinator == "descendant") {
                        for (var i = 0, node; node = nodes[i]; i++)
                            h.concat(results, node.getElementsByTagName(tagName));
                        return results;
                    } else nodes = this[combinator](nodes);
                    if (tagName == "*") return nodes;
                }
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node.tagName.toUpperCase() === uTagName) results.push(node);
                return results;
            } else return root.getElementsByTagName(tagName);
        },

        id: function(nodes, root, id, combinator) {
            var targetNode = $(id), h = Selector.handlers;
            if (!targetNode) return [];
            if (!nodes && root == document) return [targetNode];
            if (nodes) {
                if (combinator) {
                    if (combinator == 'child') {
                        for (var i = 0, node; node = nodes[i]; i++)
                            if (targetNode.parentNode == node) return [targetNode];
                    } else if (combinator == 'descendant') {
                        for (var i = 0, node; node = nodes[i]; i++)
                            if (Element.descendantOf(targetNode, node)) return [targetNode];
                    } else if (combinator == 'adjacent') {
                        for (var i = 0, node; node = nodes[i]; i++)
                            if (Selector.handlers.previousElementSibling(targetNode) == node)
                            return [targetNode];
                    } else nodes = h[combinator](nodes);
                }
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node == targetNode) return [targetNode];
                return [];
            }
            return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
        },

        className: function(nodes, root, className, combinator) {
            if (nodes && combinator) nodes = this[combinator](nodes);
            return Selector.handlers.byClassName(nodes, root, className);
        },

        byClassName: function(nodes, root, className) {
            if (!nodes) nodes = Selector.handlers.descendant([root]);
            var needle = ' ' + className + ' ';
            for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
                nodeClassName = node.className;
                if (nodeClassName.length == 0) continue;
                if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
                    results.push(node);
            }
            return results;
        },

        attrPresence: function(nodes, root, attr, combinator) {
            if (!nodes) nodes = root.getElementsByTagName("*");
            if (nodes && combinator) nodes = this[combinator](nodes);
            var results = [];
            for (var i = 0, node; node = nodes[i]; i++)
                if (Element.hasAttribute(node, attr)) results.push(node);
            return results;
        },

        attr: function(nodes, root, attr, value, operator, combinator) {
            if (!nodes) nodes = root.getElementsByTagName("*");
            if (nodes && combinator) nodes = this[combinator](nodes);
            var handler = Selector.operators[operator], results = [];
            for (var i = 0, node; node = nodes[i]; i++) {
                var nodeValue = Element.readAttribute(node, attr);
                if (nodeValue === null) continue;
                if (handler(nodeValue, value)) results.push(node);
            }
            return results;
        },

        pseudo: function(nodes, name, value, root, combinator) {
            if (nodes && combinator) nodes = this[combinator](nodes);
            if (!nodes) nodes = root.getElementsByTagName("*");
            return Selector.pseudos[name](nodes, value, root);
        }
    },

    pseudos: {
        'first-child': function(nodes, value, root) {
            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                if (Selector.handlers.previousElementSibling(node)) continue;
                results.push(node);
            }
            return results;
        },
        'last-child': function(nodes, value, root) {
            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                if (Selector.handlers.nextElementSibling(node)) continue;
                results.push(node);
            }
            return results;
        },
        'only-child': function(nodes, value, root) {
            var h = Selector.handlers;
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
                results.push(node);
            return results;
        },
        'nth-child': function(nodes, formula, root) {
            return Selector.pseudos.nth(nodes, formula, root);
        },
        'nth-last-child': function(nodes, formula, root) {
            return Selector.pseudos.nth(nodes, formula, root, true);
        },
        'nth-of-type': function(nodes, formula, root) {
            return Selector.pseudos.nth(nodes, formula, root, false, true);
        },
        'nth-last-of-type': function(nodes, formula, root) {
            return Selector.pseudos.nth(nodes, formula, root, true, true);
        },
        'first-of-type': function(nodes, formula, root) {
            return Selector.pseudos.nth(nodes, "1", root, false, true);
        },
        'last-of-type': function(nodes, formula, root) {
            return Selector.pseudos.nth(nodes, "1", root, true, true);
        },
        'only-of-type': function(nodes, formula, root) {
            var p = Selector.pseudos;
            return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
        },

        // handles the an+b logic
        getIndices: function(a, b, total) {
            if (a == 0) return b > 0 ? [b] : [];
            return $R(1, total).inject([], function(memo, i) {
                if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
                return memo;
            });
        },

        // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
        nth: function(nodes, formula, root, reverse, ofType) {
            if (nodes.length == 0) return [];
            if (formula == 'even') formula = '2n+0';
            if (formula == 'odd') formula = '2n+1';
            var h = Selector.handlers, results = [], indexed = [], m;
            h.mark(nodes);
            for (var i = 0, node; node = nodes[i]; i++) {
                if (!node.parentNode._countedByPrototype) {
                    h.index(node.parentNode, reverse, ofType);
                    indexed.push(node.parentNode);
                }
            }
            if (formula.match(/^\d+$/)) { // just a number
                formula = Number(formula);
                for (var i = 0, node; node = nodes[i]; i++)
                    if (node.nodeIndex == formula) results.push(node);
            } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
                if (m[1] == "-") m[1] = -1;
                var a = m[1] ? Number(m[1]) : 1;
                var b = m[2] ? Number(m[2]) : 0;
                var indices = Selector.pseudos.getIndices(a, b, nodes.length);
                for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
                    for (var j = 0; j < l; j++)
                        if (node.nodeIndex == indices[j]) results.push(node);
                }
            }
            h.unmark(nodes);
            h.unmark(indexed);
            return results;
        },

        'empty': function(nodes, value, root) {
            for (var i = 0, results = [], node; node = nodes[i]; i++) {
                // IE treats comments as element nodes
                if (node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
                results.push(node);
            }
            return results;
        },

        'not': function(nodes, selector, root) {
            var h = Selector.handlers, selectorType, m;
            var exclusions = new Selector(selector).findElements(root);
            h.mark(exclusions);
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (!node._countedByPrototype) results.push(node);
            h.unmark(exclusions);
            return results;
        },

        'enabled': function(nodes, value, root) {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (!node.disabled) results.push(node);
            return results;
        },

        'disabled': function(nodes, value, root) {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (node.disabled) results.push(node);
            return results;
        },

        'checked': function(nodes, value, root) {
            for (var i = 0, results = [], node; node = nodes[i]; i++)
                if (node.checked) results.push(node);
            return results;
        }
    },

    operators: {
        '=': function(nv, v) { return nv == v; },
        '!=': function(nv, v) { return nv != v; },
        '^=': function(nv, v) { return nv.startsWith(v); },
        '$=': function(nv, v) { return nv.endsWith(v); },
        '*=': function(nv, v) { return nv.include(v); },
        '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
        '|=': function(nv, v) { return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-'); }
    },

    split: function(expression) {
        var expressions = [];
        expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
            expressions.push(m[1].strip());
        });
        return expressions;
    },

    matchElements: function(elements, expression) {
        var matches = $$(expression), h = Selector.handlers;
        h.mark(matches);
        for (var i = 0, results = [], element; element = elements[i]; i++)
            if (element._countedByPrototype) results.push(element);
        h.unmark(matches);
        return results;
    },

    findElement: function(elements, expression, index) {
        if (Object.isNumber(expression)) {
            index = expression; expression = false;
        }
        return Selector.matchElements(elements, expression || '*')[index || 0];
    },

    findChildElements: function(element, expressions) {
        expressions = Selector.split(expressions.join(','));
        var results = [], h = Selector.handlers;
        for (var i = 0, l = expressions.length, selector; i < l; i++) {
            selector = new Selector(expressions[i].strip());
            h.concat(results, selector.findElements(element));
        }
        return (l > 1) ? h.unique(results) : results;
    }
});

if (Prototype.Browser.IE) {
    Object.extend(Selector.handlers, {
        // IE returns comment nodes on getElementsByTagName("*").
        // Filter them out.
        concat: function(a, b) {
            for (var i = 0, node; node = b[i]; i++)
                if (node.tagName !== "!") a.push(node);
            return a;
        },

        // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
        unmark: function(nodes) {
            for (var i = 0, node; node = nodes[i]; i++)
                node.removeAttribute('_countedByPrototype');
            return nodes;
        }
    });
}

function $$() {
    return Selector.findChildElements(document, $A(arguments));
}
var Form = {
    reset: function(form) {
        $(form).reset();
        return form;
    },

    serializeElements: function(elements, options) {
        if (typeof options != 'object') options = { hash: !!options };
        else if (Object.isUndefined(options.hash)) options.hash = true;
        var key, value, submitted = false, submit = options.submit;

        var data = elements.inject({}, function(result, element) {
            if (!element.disabled && element.name) {
                key = element.name; value = $(element).getValue();
                if (value != null && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
                    if (key in result) {
                        // a key is already present; construct an array of values
                        if (!Object.isArray(result[key])) result[key] = [result[key]];
                        result[key].push(value);
                    }
                    else result[key] = value;
                }
            }
            return result;
        });

        return options.hash ? data : Object.toQueryString(data);
    }
};

Form.Methods = {
    serialize: function(form, options) {
        return Form.serializeElements(Form.getElements(form), options);
    },

    getElements: function(form) {
        return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
          if (Form.Element.Serializers[child.tagName.toLowerCase()])
              elements.push(Element.extend(child));
          return elements;
      }
    );
    },

    getInputs: function(form, typeName, name) {
        form = $(form);
        var inputs = form.getElementsByTagName('input');

        if (!typeName && !name) return $A(inputs).map(Element.extend);

        for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
            var input = inputs[i];
            if ((typeName && input.type != typeName) || (name && input.name != name))
                continue;
            matchingInputs.push(Element.extend(input));
        }

        return matchingInputs;
    },

    disable: function(form) {
        form = $(form);
        Form.getElements(form).invoke('disable');
        return form;
    },

    enable: function(form) {
        form = $(form);
        Form.getElements(form).invoke('enable');
        return form;
    },

    findFirstElement: function(form) {
        var elements = $(form).getElements().findAll(function(element) {
            return 'hidden' != element.type && !element.disabled;
        });
        var firstByIndex = elements.findAll(function(element) {
            return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
        }).sortBy(function(element) { return element.tabIndex }).first();

        return firstByIndex ? firstByIndex : elements.find(function(element) {
            return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
        });
    },

    focusFirstElement: function(form) {
        form = $(form);
        form.findFirstElement().activate();
        return form;
    },

    request: function(form, options) {
        form = $(form), options = Object.clone(options || {});

        var params = options.parameters, action = form.readAttribute('action') || '';
        if (action.blank()) action = window.location.href;
        options.parameters = form.serialize(true);

        if (params) {
            if (Object.isString(params)) params = params.toQueryParams();
            Object.extend(options.parameters, params);
        }

        if (form.hasAttribute('method') && !options.method)
            options.method = form.method;

        return new Ajax.Request(action, options);
    }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
    focus: function(element) {
        $(element).focus();
        return element;
    },

    select: function(element) {
        $(element).select();
        return element;
    }
};

Form.Element.Methods = {
    serialize: function(element) {
        element = $(element);
        if (!element.disabled && element.name) {
            var value = element.getValue();
            if (value != undefined) {
                var pair = {};
                pair[element.name] = value;
                return Object.toQueryString(pair);
            }
        }
        return '';
    },

    getValue: function(element) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        return Form.Element.Serializers[method](element);
    },

    setValue: function(element, value) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        Form.Element.Serializers[method](element, value);
        return element;
    },

    clear: function(element) {
        $(element).value = '';
        return element;
    },

    present: function(element) {
        return $(element).value != '';
    },

    activate: function(element) {
        element = $(element);
        try {
            element.focus();
            if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
                element.select();
        } catch (e) { }
        return element;
    },

    disable: function(element) {
        element = $(element);
        element.blur();
        element.disabled = true;
        return element;
    },

    enable: function(element) {
        element = $(element);
        element.disabled = false;
        return element;
    }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
    input: function(element, value) {
        switch (element.type.toLowerCase()) {
            case 'checkbox':
            case 'radio':
                return Form.Element.Serializers.inputSelector(element, value);
            default:
                return Form.Element.Serializers.textarea(element, value);
        }
    },

    inputSelector: function(element, value) {
        if (Object.isUndefined(value)) return element.checked ? element.value : null;
        else element.checked = !!value;
    },

    textarea: function(element, value) {
        if (Object.isUndefined(value)) return element.value;
        else element.value = value;
    },

    select: function(element, index) {
        if (Object.isUndefined(index))
            return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
        else {
            var opt, value, single = !Object.isArray(index);
            for (var i = 0, length = element.length; i < length; i++) {
                opt = element.options[i];
                value = this.optionValue(opt);
                if (single) {
                    if (value == index) {
                        opt.selected = true;
                        return;
                    }
                }
                else opt.selected = index.include(value);
            }
        }
    },

    selectOne: function(element) {
        var index = element.selectedIndex;
        return index >= 0 ? this.optionValue(element.options[index]) : null;
    },

    selectMany: function(element) {
        var values, length = element.length;
        if (!length) return null;

        for (var i = 0, values = []; i < length; i++) {
            var opt = element.options[i];
            if (opt.selected) values.push(this.optionValue(opt));
        }
        return values;
    },

    optionValue: function(opt) {
        // extend element because hasAttribute may not be native
        return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
    }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
    initialize: function($super, element, frequency, callback) {
        $super(callback, frequency);
        this.element = $(element);
        this.lastValue = this.getValue();
    },

    execute: function() {
        var value = this.getValue();
        if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
    getValue: function() {
        return Form.serialize(this.element);
    }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
    initialize: function(element, callback) {
        this.element = $(element);
        this.callback = callback;

        this.lastValue = this.getValue();
        if (this.element.tagName.toLowerCase() == 'form')
            this.registerFormCallbacks();
        else
            this.registerCallback(this.element);
    },

    onElementEvent: function() {
        var value = this.getValue();
        if (this.lastValue != value) {
            this.callback(this.element, value);
            this.lastValue = value;
        }
    },

    registerFormCallbacks: function() {
        Form.getElements(this.element).each(this.registerCallback, this);
    },

    registerCallback: function(element) {
        if (element.type) {
            switch (element.type.toLowerCase()) {
                case 'checkbox':
                case 'radio':
                    Event.observe(element, 'click', this.onElementEvent.bind(this));
                    break;
                default:
                    Event.observe(element, 'change', this.onElementEvent.bind(this));
                    break;
            }
        }
    }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
        return Form.Element.getValue(this.element);
    }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
    getValue: function() {
        return Form.serialize(this.element);
    }
});
if (!window.Event) var Event = {};

Object.extend(Event, {
    KEY_BACKSPACE: 8,
    KEY_TAB: 9,
    KEY_RETURN: 13,
    KEY_ESC: 27,
    KEY_LEFT: 37,
    KEY_UP: 38,
    KEY_RIGHT: 39,
    KEY_DOWN: 40,
    KEY_DELETE: 46,
    KEY_HOME: 36,
    KEY_END: 35,
    KEY_PAGEUP: 33,
    KEY_PAGEDOWN: 34,
    KEY_INSERT: 45,

    cache: {},

    relatedTarget: function(event) {
        var element;
        switch (event.type) {
            case 'mouseover': element = event.fromElement; break;
            case 'mouseout': element = event.fromElement; break;
            //      case 'mouseout':  element = event.toElement;   break; 
            //      default: return null; 
            default: element = event.fromElement; break;
        }
        return Element.extend(element);
    }
});

Event.Methods = (function() {
    var isButton;

    if (Prototype.Browser.IE) {
        var buttonMap = { 0: 1, 1: 4, 2: 2 };
        isButton = function(event, code) {
            return event.button == buttonMap[code];
        };

    } else if (Prototype.Browser.WebKit) {
        isButton = function(event, code) {
            switch (code) {
                case 0: return event.which == 1 && !event.metaKey;
                case 1: return event.which == 1 && event.metaKey;
                default: return false;
            }
        };

    } else {
        isButton = function(event, code) {
            return event.which ? (event.which === code + 1) : (event.button === code);
        };
    }

    return {
        isLeftClick: function(event) { return isButton(event, 0) },
        isMiddleClick: function(event) { return isButton(event, 1) },
        isRightClick: function(event) { return isButton(event, 2) },

        element: function(event) {
            var node = Event.extend(event).target;
            return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
        },

        findElement: function(event, expression) {
            var element = Event.element(event);
            if (!expression) return element;
            var elements = [element].concat(element.ancestors());
            return Selector.findElement(elements, expression, 0);
        },

        pointer: function(event) {
            return {
                x: event.pageX || (event.clientX +
          (document.documentElement.scrollLeft || document.body.scrollLeft)),
                y: event.pageY || (event.clientY +
          (document.documentElement.scrollTop || document.body.scrollTop))
            };
        },

        pointerX: function(event) { return Event.pointer(event).x },
        pointerY: function(event) { return Event.pointer(event).y },

        stop: function(event) {
            Event.extend(event);
            event.preventDefault();
            event.stopPropagation();
            event.stopped = true;
        }
    };
})();

Event.extend = (function() {
    var methods = Object.keys(Event.Methods).inject({}, function(m, name) {
        m[name] = Event.Methods[name].methodize();
        return m;
    });

    if (Prototype.Browser.IE) {
        Object.extend(methods, {
            stopPropagation: function() { this.cancelBubble = true },
            preventDefault: function() { this.returnValue = false },
            inspect: function() { return "[object Event]" }
        });

        return function(event) {
            if (!event) return false;
            if (event._extendedByPrototype) return event;

            event._extendedByPrototype = Prototype.emptyFunction;
            var pointer = Event.pointer(event);
            Object.extend(event, {
                target: event.srcElement,
                relatedTarget: Event.relatedTarget(event),
                pageX: pointer.x,
                pageY: pointer.y
            });
            return Object.extend(event, methods);
        };

    } else {
        Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
        Object.extend(Event.prototype, methods);
        return Prototype.K;
    }
})();

Object.extend(Event, (function() {
    var cache = Event.cache;

    function getEventID(element) {
        if (element._prototypeEventID) return element._prototypeEventID[0];
        arguments.callee.id = arguments.callee.id || 1;
        return element._prototypeEventID = [++arguments.callee.id];
    }

    function getDOMEventName(eventName) {
        if (eventName && eventName.include(':')) return "dataavailable";
        return eventName;
    }

    function getCacheForID(id) {
        return cache[id] = cache[id] || {};
    }

    function getWrappersForEventName(id, eventName) {
        var c = getCacheForID(id);
        return c[eventName] = c[eventName] || [];
    }

    function createWrapper(element, eventName, handler) {
        var id = getEventID(element);
        var c = getWrappersForEventName(id, eventName);
        if (c.pluck("handler").include(handler)) return false;

        var wrapper = function(event) {
            if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
                return false;

            Event.extend(event);
            handler.call(element, event);
        };

        wrapper.handler = handler;
        c.push(wrapper);
        return wrapper;
    }

    function findWrapper(id, eventName, handler) {
        var c = getWrappersForEventName(id, eventName);
        return c.find(function(wrapper) { return wrapper.handler == handler });
    }

    function destroyWrapper(id, eventName, handler) {
        var c = getCacheForID(id);
        if (!c[eventName]) return false;
        c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
    }

    function destroyCache() {
        for (var id in cache)
            for (var eventName in cache[id])
            cache[id][eventName] = null;
    }

    if (window.attachEvent) {
        window.attachEvent("onunload", destroyCache);
    }

    return {
        observe: function(element, eventName, handler) {
            element = $(element);
            var name = getDOMEventName(eventName);

            var wrapper = createWrapper(element, eventName, handler);
            if (!wrapper) return element;

            if (element.addEventListener) {
                element.addEventListener(name, wrapper, false);
            } else {
                element.attachEvent("on" + name, wrapper);
            }

            return element;
        },

        stopObserving: function(element, eventName, handler) {
            element = $(element);
            var id = getEventID(element), name = getDOMEventName(eventName);

            if (!handler && eventName) {
                getWrappersForEventName(id, eventName).each(function(wrapper) {
                    element.stopObserving(eventName, wrapper.handler);
                });
                return element;

            } else if (!eventName) {
                Object.keys(getCacheForID(id)).each(function(eventName) {
                    element.stopObserving(eventName);
                });
                return element;
            }

            var wrapper = findWrapper(id, eventName, handler);
            if (!wrapper) return element;

            if (element.removeEventListener) {
                element.removeEventListener(name, wrapper, false);
            } else {
                element.detachEvent("on" + name, wrapper);
            }

            destroyWrapper(id, eventName, handler);

            return element;
        },

        fire: function(element, eventName, memo) {
            element = $(element);
            if (element == document && document.createEvent && !element.dispatchEvent)
                element = document.documentElement;

            var event;
            if (document.createEvent) {
                event = document.createEvent("HTMLEvents");
                event.initEvent("dataavailable", true, true);
            } else {
                event = document.createEventObject();
                event.eventType = "ondataavailable";
            }

            event.eventName = eventName;
            event.memo = memo || {};

            if (document.createEvent) {
                element.dispatchEvent(event);
            } else {
                element.fireEvent(event.eventType, event);
            }

            return Event.extend(event);
        }
    };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
    fire: Event.fire,
    observe: Event.observe,
    stopObserving: Event.stopObserving
});

Object.extend(document, {
    fire: Element.Methods.fire.methodize(),
    observe: Element.Methods.observe.methodize(),
    stopObserving: Element.Methods.stopObserving.methodize(),
    loaded: false
});

(function() {
    /* Support for the DOMContentLoaded event is based on work by Dan Webb,
    Matthias Miller, Dean Edwards and John Resig. */

    var timer;

    function fireContentLoadedEvent() {
        if (document.loaded) return;
        if (timer) window.clearInterval(timer);
        document.fire("dom:loaded");
        document.loaded = true;
    }

    if (document.addEventListener) {
        if (Prototype.Browser.WebKit) {
            timer = window.setInterval(function() {
                if (/loaded|complete/.test(document.readyState))
                    fireContentLoadedEvent();
            }, 0);

            Event.observe(window, "load", fireContentLoadedEvent);

        } else {
            document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
        }

    } else {
        document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
        $("__onDOMContentLoaded").onreadystatechange = function() {
            if (this.readyState == "complete") {
                this.onreadystatechange = null;
                fireContentLoadedEvent();
            }
        };
    }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
    Before: function(element, content) {
        return Element.insert(element, { before: content });
    },

    Top: function(element, content) {
        return Element.insert(element, { top: content });
    },

    Bottom: function(element, content) {
        return Element.insert(element, { bottom: content });
    },

    After: function(element, content) {
        return Element.insert(element, { after: content });
    }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
    // set to true if needed, warning: firefox performance problems
    // NOT neeeded for page scrolling, only if draggable contained in
    // scrollable elements
    includeScrollOffsets: false,

    // must be called before calling withinIncludingScrolloffset, every time the
    // page is scrolled
    prepare: function() {
        this.deltaX = window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
        this.deltaY = window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
    },

    // caches x/y coordinate pair to use with overlap
    within: function(element, x, y) {
        if (this.includeScrollOffsets)
            return this.withinIncludingScrolloffsets(element, x, y);
        this.xcomp = x;
        this.ycomp = y;
        this.offset = Element.cumulativeOffset(element);

        return (y >= this.offset[1] &&
            y < this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x < this.offset[0] + element.offsetWidth);
    },

    withinIncludingScrolloffsets: function(element, x, y) {
        var offsetcache = Element.cumulativeScrollOffset(element);

        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = Element.cumulativeOffset(element);

        return (this.ycomp >= this.offset[1] &&
            this.ycomp < this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp < this.offset[0] + element.offsetWidth);
    },

    // within must be called directly before
    overlap: function(mode, element) {
        if (!mode) return 0;
        if (mode == 'vertical')
            return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
        if (mode == 'horizontal')
            return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
    },

    // Deprecation layer -- use newer Element methods now (1.5.2).

    cumulativeOffset: Element.Methods.cumulativeOffset,

    positionedOffset: Element.Methods.positionedOffset,

    absolutize: function(element) {
        Position.prepare();
        return Element.absolutize(element);
    },

    relativize: function(element) {
        Position.prepare();
        return Element.relativize(element);
    },

    realOffset: Element.Methods.cumulativeScrollOffset,

    offsetParent: Element.Methods.getOffsetParent,

    page: Element.Methods.viewportOffset,

    clone: function(source, target, options) {
        options = options || {};
        return Element.clonePosition(target, source, options);
    }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods) {
    function iter(name) {
        return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
    }

    instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
      className = className.toString().strip();
      var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
      return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
      className = className.toString().strip();
      var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
      if (!classNames && !className) return elements;

      var nodes = $(element).getElementsByTagName('*');
      className = ' ' + className + ' ';

      for (var i = 0, child, cn; child = nodes[i]; i++) {
          if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
              return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
              elements.push(Element.extend(child));
      }
      return elements;
  };

    return function(className, parentElement) {
        return $(parentElement || document.body).getElementsByClassName(className);
    };
} (Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
    initialize: function(element) {
        this.element = $(element);
    },

    _each: function(iterator) {
        this.element.className.split(/\s+/).select(function(name) {
            return name.length > 0;
        })._each(iterator);
    },

    set: function(className) {
        this.element.className = className;
    },

    add: function(classNameToAdd) {
        if (this.include(classNameToAdd)) return;
        this.set($A(this).concat(classNameToAdd).join(' '));
    },

    remove: function(classNameToRemove) {
        if (!this.include(classNameToRemove)) return;
        this.set($A(this).without(classNameToRemove).join(' '));
    },

    toString: function() {
        return $A(this).join(' ');
    }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();


//////////////////////////////////////////////////////////////////////////////////////////////////////

// script.aculo.us scriptaculous.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// For details, see the script.aculo.us web site: http://script.aculo.us/

var Scriptaculous = {
    Version: '1.8.1',
    require: function(libraryName) {
        // inserting via DOM fails in Safari 2.0, so brute force approach
        document.write('<script type="text/javascript" src="' + libraryName + '"><\/script>');
    },
    REQUIRED_PROTOTYPE: '1.6.0',
    load: function() {
        function convertVersionString(versionString) {
            var r = versionString.split('.');
            return parseInt(r[0]) * 100000 + parseInt(r[1]) * 1000 + parseInt(r[2]);
        }

        if ((typeof Prototype == 'undefined') ||
       (typeof Element == 'undefined') ||
       (typeof Element.Methods == 'undefined') ||
       (convertVersionString(Prototype.Version) <
        convertVersionString(Scriptaculous.REQUIRED_PROTOTYPE)))
            throw ("script.aculo.us requires the Prototype JavaScript framework >= " +
        Scriptaculous.REQUIRED_PROTOTYPE);

        $A(document.getElementsByTagName("script")).findAll(function(s) {
            return (s.src && s.src.match(/scriptaculous\.js(\?.*)?$/))
        }).each(function(s) {
            var path = s.src.replace(/scriptaculous\.js(\?.*)?$/, '');
            var includes = s.src.match(/\?.*load=([a-z,]*)/);
            (includes ? includes[1] : 'builder,effects,dragdrop,controls,slider,sound').split(',').each(
       function(include) { Scriptaculous.require(path + include + '.js') });
        });
    }
}

Scriptaculous.load();

////////////////////////////////////////////////////////////////////////////////////

// script.aculo.us effects.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
// Contributors:
//  Justin Palmer (http://encytemedia.com/)
//  Mark Pilgrim (http://diveintomark.org/)
//  Martin Bialasinki
// 
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/ 

// converts rgb() and #xxx to #xxxxxx format,  
// returns self (or first argument) if not convertable  
String.prototype.parseColor = function() {
    var color = '#';
    if (this.slice(0, 4) == 'rgb(') {
        var cols = this.slice(4, this.length - 1).split(',');
        var i = 0; do { color += parseInt(cols[i]).toColorPart() } while (++i < 3);
    } else {
        if (this.slice(0, 1) == '#') {
            if (this.length == 4) for (var i = 1; i < 4; i++) color += (this.charAt(i) + this.charAt(i)).toLowerCase();
            if (this.length == 7) color = this.toLowerCase();
        }
    }
    return (color.length == 7 ? color : (arguments[0] || this));
};

/*--------------------------------------------------------------------------*/

Element.collectTextNodes = function(element) {
    return $A($(element).childNodes).collect(function(node) {
        return (node.nodeType == 3 ? node.nodeValue :
      (node.hasChildNodes() ? Element.collectTextNodes(node) : ''));
    }).flatten().join('');
};

Element.collectTextNodesIgnoreClass = function(element, className) {
    return $A($(element).childNodes).collect(function(node) {
        return (node.nodeType == 3 ? node.nodeValue :
      ((node.hasChildNodes() && !Element.hasClassName(node, className)) ?
        Element.collectTextNodesIgnoreClass(node, className) : ''));
    }).flatten().join('');
};

Element.setContentZoom = function(element, percent) {
    element = $(element);
    element.setStyle({ fontSize: (percent / 100) + 'em' });
    if (Prototype.Browser.WebKit) window.scrollBy(0, 0);
    return element;
};

Element.getInlineOpacity = function(element) {
    return $(element).style.opacity || '';
};

Element.forceRerendering = function(element) {
    try {
        element = $(element);
        var n = document.createTextNode(' ');
        element.appendChild(n);
        element.removeChild(n);
    } catch (e) { }
};

/*--------------------------------------------------------------------------*/

var Effect = {
    _elementDoesNotExistError: {
        name: 'ElementDoesNotExistError',
        message: 'The specified DOM element does not exist, but is required for this effect to operate'
    },
    Transitions: {
        linear: Prototype.K,
        sinoidal: function(pos) {
            return (-Math.cos(pos * Math.PI) / 2) + 0.5;
        },
        reverse: function(pos) {
            return 1 - pos;
        },
        flicker: function(pos) {
            var pos = ((-Math.cos(pos * Math.PI) / 4) + 0.75) + Math.random() / 4;
            return pos > 1 ? 1 : pos;
        },
        wobble: function(pos) {
            return (-Math.cos(pos * Math.PI * (9 * pos)) / 2) + 0.5;
        },
        pulse: function(pos, pulses) {
            pulses = pulses || 5;
            return (
        ((pos % (1 / pulses)) * pulses).round() == 0 ?
              ((pos * pulses * 2) - (pos * pulses * 2).floor()) :
          1 - ((pos * pulses * 2) - (pos * pulses * 2).floor())
        );
        },
        spring: function(pos) {
            return 1 - (Math.cos(pos * 4.5 * Math.PI) * Math.exp(-pos * 6));
        },
        none: function(pos) {
            return 0;
        },
        full: function(pos) {
            return 1;
        }
    },
    DefaultOptions: {
        duration: 1.0,   // seconds
        fps: 100,   // 100= assume 66fps max.
        sync: false, // true for combining
        from: 0.0,
        to: 1.0,
        delay: 0.0,
        queue: 'parallel'
    },
    tagifyText: function(element) {
        var tagifyStyle = 'position:relative';
        if (Prototype.Browser.IE) tagifyStyle += ';zoom:1';

        element = $(element);
        $A(element.childNodes).each(function(child) {
            if (child.nodeType == 3) {
                child.nodeValue.toArray().each(function(character) {
                    element.insertBefore(
            new Element('span', { style: tagifyStyle }).update(
              character == ' ' ? String.fromCharCode(160) : character),
              child);
                });
                Element.remove(child);
            }
        });
    },
    multiple: function(element, effect) {
        var elements;
        if (((typeof element == 'object') ||
        Object.isFunction(element)) &&
       (element.length))
            elements = element;
        else
            elements = $(element).childNodes;

        var options = Object.extend({
            speed: 0.1,
            delay: 0.0
        }, arguments[2] || {});
        var masterDelay = options.delay;

        $A(elements).each(function(element, index) {
            new effect(element, Object.extend(options, { delay: index * options.speed + masterDelay }));
        });
    },
    PAIRS: {
        'slide': ['SlideDown', 'SlideUp'],
        'blind': ['BlindDown', 'BlindUp'],
        'appear': ['Appear', 'Fade']
    },
    toggle: function(element, effect) {
        element = $(element);
        effect = (effect || 'appear').toLowerCase();
        var options = Object.extend({
            queue: { position: 'end', scope: (element.id || 'global'), limit: 1 }
        }, arguments[2] || {});
        Effect[element.visible() ?
      Effect.PAIRS[effect][1] : Effect.PAIRS[effect][0]](element, options);
    }
};

Effect.DefaultOptions.transition = Effect.Transitions.sinoidal;

/* ------------- core effects ------------- */

Effect.ScopedQueue = Class.create(Enumerable, {
    initialize: function() {
        this.effects = [];
        this.interval = null;
    },
    _each: function(iterator) {
        this.effects._each(iterator);
    },
    add: function(effect) {
        var timestamp = new Date().getTime();

        var position = Object.isString(effect.options.queue) ?
      effect.options.queue : effect.options.queue.position;

        switch (position) {
            case 'front':
                // move unstarted effects after this effect  
                this.effects.findAll(function(e) { return e.state == 'idle' }).each(function(e) {
                    e.startOn += effect.finishOn;
                    e.finishOn += effect.finishOn;
                });
                break;
            case 'with-last':
                timestamp = this.effects.pluck('startOn').max() || timestamp;
                break;
            case 'end':
                // start effect after last queued effect has finished
                timestamp = this.effects.pluck('finishOn').max() || timestamp;
                break;
        }

        effect.startOn += timestamp;
        effect.finishOn += timestamp;

        if (!effect.options.queue.limit || (this.effects.length < effect.options.queue.limit))
            this.effects.push(effect);

        if (!this.interval)
            this.interval = setInterval(this.loop.bind(this), 15);
    },
    remove: function(effect) {
        this.effects = this.effects.reject(function(e) { return e == effect });
        if (this.effects.length == 0) {
            clearInterval(this.interval);
            this.interval = null;
        }
    },
    loop: function() {
        var timePos = new Date().getTime();
        for (var i = 0, len = this.effects.length; i < len; i++)
            this.effects[i] && this.effects[i].loop(timePos);
    }
});

Effect.Queues = {
    instances: $H(),
    get: function(queueName) {
        if (!Object.isString(queueName)) return queueName;

        return this.instances.get(queueName) ||
      this.instances.set(queueName, new Effect.ScopedQueue());
    }
};
Effect.Queue = Effect.Queues.get('global');

Effect.Base = Class.create({
    position: null,
    start: function(options) {
        function codeForEvent(options, eventName) {
            return (
        (options[eventName + 'Internal'] ? 'this.options.' + eventName + 'Internal(this);' : '') +
        (options[eventName] ? 'this.options.' + eventName + '(this);' : '')
      );
        }
        if (options && options.transition === false) options.transition = Effect.Transitions.linear;
        this.options = Object.extend(Object.extend({}, Effect.DefaultOptions), options || {});
        this.currentFrame = 0;
        this.state = 'idle';
        this.startOn = this.options.delay * 1000;
        this.finishOn = this.startOn + (this.options.duration * 1000);
        this.fromToDelta = this.options.to - this.options.from;
        this.totalTime = this.finishOn - this.startOn;
        this.totalFrames = this.options.fps * this.options.duration;

        eval('this.render = function(pos){ ' +
      'if (this.state=="idle"){this.state="running";' +
      codeForEvent(this.options, 'beforeSetup') +
      (this.setup ? 'this.setup();' : '') +
      codeForEvent(this.options, 'afterSetup') +
      '};if (this.state=="running"){' +
      'pos=this.options.transition(pos)*' + this.fromToDelta + '+' + this.options.from + ';' +
      'this.position=pos;' +
      codeForEvent(this.options, 'beforeUpdate') +
      (this.update ? 'this.update(pos);' : '') +
      codeForEvent(this.options, 'afterUpdate') +
      '}}');

        this.event('beforeStart');
        if (!this.options.sync)
            Effect.Queues.get(Object.isString(this.options.queue) ?
        'global' : this.options.queue.scope).add(this);
    },
    loop: function(timePos) {
        if (timePos >= this.startOn) {
            if (timePos >= this.finishOn) {
                this.render(1.0);
                this.cancel();
                this.event('beforeFinish');
                if (this.finish) this.finish();
                this.event('afterFinish');
                return;
            }
            var pos = (timePos - this.startOn) / this.totalTime,
          frame = (pos * this.totalFrames).round();
            if (frame > this.currentFrame) {
                this.render(pos);
                this.currentFrame = frame;
            }
        }
    },
    cancel: function() {
        if (!this.options.sync)
            Effect.Queues.get(Object.isString(this.options.queue) ?
        'global' : this.options.queue.scope).remove(this);
        this.state = 'finished';
    },
    event: function(eventName) {
        if (this.options[eventName + 'Internal']) this.options[eventName + 'Internal'](this);
        if (this.options[eventName]) this.options[eventName](this);
    },
    inspect: function() {
        var data = $H();
        for (property in this)
            if (!Object.isFunction(this[property])) data.set(property, this[property]);
        return '#<Effect:' + data.inspect() + ',options:' + $H(this.options).inspect() + '>';
    }
});

Effect.Parallel = Class.create(Effect.Base, {
    initialize: function(effects) {
        this.effects = effects || [];
        this.start(arguments[1]);
    },
    update: function(position) {
        this.effects.invoke('render', position);
    },
    finish: function(position) {
        this.effects.each(function(effect) {
            effect.render(1.0);
            effect.cancel();
            effect.event('beforeFinish');
            if (effect.finish) effect.finish(position);
            effect.event('afterFinish');
        });
    }
});

Effect.Tween = Class.create(Effect.Base, {
    initialize: function(object, from, to) {
        object = Object.isString(object) ? $(object) : object;
        var args = $A(arguments), method = args.last(),
      options = args.length == 5 ? args[3] : null;
        this.method = Object.isFunction(method) ? method.bind(object) :
      Object.isFunction(object[method]) ? object[method].bind(object) :
      function(value) { object[method] = value };
        this.start(Object.extend({ from: from, to: to }, options || {}));
    },
    update: function(position) {
        this.method(position);
    }
});

Effect.Event = Class.create(Effect.Base, {
    initialize: function() {
        this.start(Object.extend({ duration: 0 }, arguments[0] || {}));
    },
    update: Prototype.emptyFunction
});

Effect.Opacity = Class.create(Effect.Base, {
    initialize: function(element) {
        this.element = $(element);
        if (!this.element) throw (Effect._elementDoesNotExistError);
        // make this work on IE on elements without 'layout'
        if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
            this.element.setStyle({ zoom: 1 });
        var options = Object.extend({
            from: this.element.getOpacity() || 0.0,
            to: 1.0
        }, arguments[1] || {});
        this.start(options);
    },
    update: function(position) {
        this.element.setOpacity(position);
    }
});

Effect.Move = Class.create(Effect.Base, {
    initialize: function(element) {
        this.element = $(element);
        if (!this.element) throw (Effect._elementDoesNotExistError);
        var options = Object.extend({
            x: 0,
            y: 0,
            mode: 'relative'
        }, arguments[1] || {});
        this.start(options);
    },
    setup: function() {
        this.element.makePositioned();
        this.originalLeft = parseFloat(this.element.getStyle('left') || '0');
        this.originalTop = parseFloat(this.element.getStyle('top') || '0');
        if (this.options.mode == 'absolute') {
            this.options.x = this.options.x - this.originalLeft;
            this.options.y = this.options.y - this.originalTop;
        }
    },
    update: function(position) {
        this.element.setStyle({
            left: (this.options.x * position + this.originalLeft).round() + 'px',
            top: (this.options.y * position + this.originalTop).round() + 'px'
        });
    }
});

// for backwards compatibility
Effect.MoveBy = function(element, toTop, toLeft) {
    return new Effect.Move(element,
    Object.extend({ x: toLeft, y: toTop }, arguments[3] || {}));
};

Effect.Scale = Class.create(Effect.Base, {
    initialize: function(element, percent) {
        this.element = $(element);
        if (!this.element) throw (Effect._elementDoesNotExistError);
        var options = Object.extend({
            scaleX: true,
            scaleY: true,
            scaleContent: true,
            scaleFromCenter: false,
            scaleMode: 'box',        // 'box' or 'contents' or { } with provided values
            scaleFrom: 100.0,
            scaleTo: percent
        }, arguments[2] || {});
        this.start(options);
    },
    setup: function() {
        this.restoreAfterFinish = this.options.restoreAfterFinish || false;
        this.elementPositioning = this.element.getStyle('position');

        this.originalStyle = {};
        ['top', 'left', 'width', 'height', 'fontSize'].each(function(k) {
            this.originalStyle[k] = this.element.style[k];
        } .bind(this));

        this.originalTop = this.element.offsetTop;
        this.originalLeft = this.element.offsetLeft;

        var fontSize = this.element.getStyle('font-size') || '100%';
        ['em', 'px', '%', 'pt'].each(function(fontSizeType) {
            if (fontSize.indexOf(fontSizeType) > 0) {
                this.fontSize = parseFloat(fontSize);
                this.fontSizeType = fontSizeType;
            }
        } .bind(this));

        this.factor = (this.options.scaleTo - this.options.scaleFrom) / 100;

        this.dims = null;
        if (this.options.scaleMode == 'box')
            this.dims = [this.element.offsetHeight, this.element.offsetWidth];
        if (/^content/.test(this.options.scaleMode))
            this.dims = [this.element.scrollHeight, this.element.scrollWidth];
        if (!this.dims)
            this.dims = [this.options.scaleMode.originalHeight,
                   this.options.scaleMode.originalWidth];
    },
    update: function(position) {
        var currentScale = (this.options.scaleFrom / 100.0) + (this.factor * position);
        if (this.options.scaleContent && this.fontSize)
            this.element.setStyle({ fontSize: this.fontSize * currentScale + this.fontSizeType });
        this.setDimensions(this.dims[0] * currentScale, this.dims[1] * currentScale);
    },
    finish: function(position) {
        if (this.restoreAfterFinish) this.element.setStyle(this.originalStyle);
    },
    setDimensions: function(height, width) {
        var d = {};
        if (this.options.scaleX) d.width = width.round() + 'px';
        if (this.options.scaleY) d.height = height.round() + 'px';
        if (this.options.scaleFromCenter) {
            var topd = (height - this.dims[0]) / 2;
            var leftd = (width - this.dims[1]) / 2;
            if (this.elementPositioning == 'absolute') {
                if (this.options.scaleY) d.top = this.originalTop - topd + 'px';
                if (this.options.scaleX) d.left = this.originalLeft - leftd + 'px';
            } else {
                if (this.options.scaleY) d.top = -topd + 'px';
                if (this.options.scaleX) d.left = -leftd + 'px';
            }
        }
        this.element.setStyle(d);
    }
});

Effect.Highlight = Class.create(Effect.Base, {
    initialize: function(element) {
        this.element = $(element);
        if (!this.element) throw (Effect._elementDoesNotExistError);
        var options = Object.extend({ startcolor: '#ffff99' }, arguments[1] || {});
        this.start(options);
    },
    setup: function() {
        // Prevent executing on elements not in the layout flow
        if (this.element.getStyle('display') == 'none') { this.cancel(); return; }
        // Disable background image during the effect
        this.oldStyle = {};
        if (!this.options.keepBackgroundImage) {
            this.oldStyle.backgroundImage = this.element.getStyle('background-image');
            this.element.setStyle({ backgroundImage: 'none' });
        }
        if (!this.options.endcolor)
            this.options.endcolor = this.element.getStyle('background-color').parseColor('#ffffff');
        if (!this.options.restorecolor)
            this.options.restorecolor = this.element.getStyle('background-color');
        // init color calculations
        this._base = $R(0, 2).map(function(i) { return parseInt(this.options.startcolor.slice(i * 2 + 1, i * 2 + 3), 16) } .bind(this));
        this._delta = $R(0, 2).map(function(i) { return parseInt(this.options.endcolor.slice(i * 2 + 1, i * 2 + 3), 16) - this._base[i] } .bind(this));
    },
    update: function(position) {
        this.element.setStyle({ backgroundColor: $R(0, 2).inject('#', function(m, v, i) {
            return m + ((this._base[i] + (this._delta[i] * position)).round().toColorPart());
        } .bind(this))
        });
    },
    finish: function() {
        this.element.setStyle(Object.extend(this.oldStyle, {
            backgroundColor: this.options.restorecolor
        }));
    }
});

Effect.ScrollTo = function(element) {
    var options = arguments[1] || {},
    scrollOffsets = document.viewport.getScrollOffsets(),
    elementOffsets = $(element).cumulativeOffset(),
    max = (window.height || document.body.scrollHeight) - document.viewport.getHeight();

    if (options.offset) elementOffsets[1] += options.offset;

    return new Effect.Tween(null,
    scrollOffsets.top,
    elementOffsets[1] > max ? max : elementOffsets[1],
    options,
    function(p) { scrollTo(scrollOffsets.left, p.round()) }
  );
};

/* ------------- combination effects ------------- */

Effect.Fade = function(element) {
    element = $(element);
    var oldOpacity = element.getInlineOpacity();
    var options = Object.extend({
        from: element.getOpacity() || 1.0,
        to: 0.0,
        afterFinishInternal: function(effect) {
            if (effect.options.to != 0) return;
            effect.element.hide().setStyle({ opacity: oldOpacity });
        }
    }, arguments[1] || {});
    return new Effect.Opacity(element, options);
};

Effect.Appear = function(element) {
    element = $(element);
    var options = Object.extend({
        from: (element.getStyle('display') == 'none' ? 0.0 : element.getOpacity() || 0.0),
        to: 1.0,
        // force Safari to render floated elements properly
        afterFinishInternal: function(effect) {
            effect.element.forceRerendering();
        },
        beforeSetup: function(effect) {
            effect.element.setOpacity(effect.options.from).show();
        } 
    }, arguments[1] || {});
    return new Effect.Opacity(element, options);
};

Effect.Puff = function(element) {
    element = $(element);
    var oldStyle = {
        opacity: element.getInlineOpacity(),
        position: element.getStyle('position'),
        top: element.style.top,
        left: element.style.left,
        width: element.style.width,
        height: element.style.height
    };
    return new Effect.Parallel(
   [new Effect.Scale(element, 200,
      { sync: true, scaleFromCenter: true, scaleContent: true, restoreAfterFinish: true }),
     new Effect.Opacity(element, { sync: true, to: 0.0 })],
     Object.extend({ duration: 1.0,
         beforeSetupInternal: function(effect) {
             Position.absolutize(effect.effects[0].element)
         },
         afterFinishInternal: function(effect) {
             effect.effects[0].element.hide().setStyle(oldStyle);
         }
     }, arguments[1] || {})
   );
};

Effect.BlindUp = function(element) {
    element = $(element);
    element.makeClipping();
    return new Effect.Scale(element, 0,
    Object.extend({ scaleContent: false,
        scaleX: false,
        restoreAfterFinish: true,
        afterFinishInternal: function(effect) {
            effect.element.hide().undoClipping();
        }
    }, arguments[1] || {})
  );
};

Effect.BlindDown = function(element) {
    element = $(element);
    var elementDimensions = element.getDimensions();
    return new Effect.Scale(element, 100, Object.extend({
        scaleContent: false,
        scaleX: false,
        scaleFrom: 0,
        scaleMode: { originalHeight: elementDimensions.height, originalWidth: elementDimensions.width },
        restoreAfterFinish: true,
        afterSetup: function(effect) {
            effect.element.makeClipping().setStyle({ height: '0px' }).show();
        },
        afterFinishInternal: function(effect) {
            effect.element.undoClipping();
        }
    }, arguments[1] || {}));
};

Effect.SwitchOff = function(element) {
    element = $(element);
    var oldOpacity = element.getInlineOpacity();
    return new Effect.Appear(element, Object.extend({
        duration: 0.4,
        from: 0,
        transition: Effect.Transitions.flicker,
        afterFinishInternal: function(effect) {
            new Effect.Scale(effect.element, 1, {
                duration: 0.3, scaleFromCenter: true,
                scaleX: false, scaleContent: false, restoreAfterFinish: true,
                beforeSetup: function(effect) {
                    effect.element.makePositioned().makeClipping();
                },
                afterFinishInternal: function(effect) {
                    effect.element.hide().undoClipping().undoPositioned().setStyle({ opacity: oldOpacity });
                }
            })
        }
    }, arguments[1] || {}));
};

Effect.DropOut = function(element) {
    element = $(element);
    var oldStyle = {
        top: element.getStyle('top'),
        left: element.getStyle('left'),
        opacity: element.getInlineOpacity()
    };
    return new Effect.Parallel(
    [new Effect.Move(element, { x: 0, y: 100, sync: true }),
      new Effect.Opacity(element, { sync: true, to: 0.0 })],
    Object.extend(
      { duration: 0.5,
          beforeSetup: function(effect) {
              effect.effects[0].element.makePositioned();
          },
          afterFinishInternal: function(effect) {
              effect.effects[0].element.hide().undoPositioned().setStyle(oldStyle);
          }
      }, arguments[1] || {}));
};

Effect.Shake = function(element) {
    element = $(element);
    var options = Object.extend({
        distance: 20,
        duration: 0.5
    }, arguments[1] || {});
    var distance = parseFloat(options.distance);
    var split = parseFloat(options.duration) / 10.0;
    var oldStyle = {
        top: element.getStyle('top'),
        left: element.getStyle('left')
    };
    return new Effect.Move(element,
      { x: distance, y: 0, duration: split, afterFinishInternal: function(effect) {
          new Effect.Move(effect.element,
      { x: -distance * 2, y: 0, duration: split * 2, afterFinishInternal: function(effect) {
          new Effect.Move(effect.element,
      { x: distance * 2, y: 0, duration: split * 2, afterFinishInternal: function(effect) {
          new Effect.Move(effect.element,
      { x: -distance * 2, y: 0, duration: split * 2, afterFinishInternal: function(effect) {
          new Effect.Move(effect.element,
      { x: distance * 2, y: 0, duration: split * 2, afterFinishInternal: function(effect) {
          new Effect.Move(effect.element,
      { x: -distance, y: 0, duration: split, afterFinishInternal: function(effect) {
          effect.element.undoPositioned().setStyle(oldStyle);
      } 
      })
      } 
      })
      } 
      })
      } 
      })
      } 
      })
      } 
      });
};

Effect.SlideDown = function(element) {
    element = $(element).cleanWhitespace();
    // SlideDown need to have the content of the element wrapped in a container element with fixed height!
    var oldInnerBottom = element.down().getStyle('bottom');
    var elementDimensions = element.getDimensions();
    return new Effect.Scale(element, 100, Object.extend({
        scaleContent: false,
        scaleX: false,
        scaleFrom: window.opera ? 0 : 1,
        scaleMode: { originalHeight: elementDimensions.height, originalWidth: elementDimensions.width },
        restoreAfterFinish: true,
        afterSetup: function(effect) {
            effect.element.makePositioned();
            effect.element.down().makePositioned();
            if (window.opera) effect.element.setStyle({ top: '' });
            effect.element.makeClipping().setStyle({ height: '0px' }).show();
        },
        afterUpdateInternal: function(effect) {
            effect.element.down().setStyle({ bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px'
            });
        },
        afterFinishInternal: function(effect) {
            effect.element.undoClipping().undoPositioned();
            effect.element.down().undoPositioned().setStyle({ bottom: oldInnerBottom });
        }
    }, arguments[1] || {})
  );
};

Effect.SlideUp = function(element) {
    element = $(element).cleanWhitespace();
    var oldInnerBottom = element.down().getStyle('bottom');
    var elementDimensions = element.getDimensions();
    return new Effect.Scale(element, window.opera ? 0 : 1,
   Object.extend({ scaleContent: false,
       scaleX: false,
       scaleMode: 'box',
       scaleFrom: 100,
       scaleMode: { originalHeight: elementDimensions.height, originalWidth: elementDimensions.width },
       restoreAfterFinish: true,
       afterSetup: function(effect) {
           effect.element.makePositioned();
           effect.element.down().makePositioned();
           if (window.opera) effect.element.setStyle({ top: '' });
           effect.element.makeClipping().show();
       },
       afterUpdateInternal: function(effect) {
           effect.element.down().setStyle({ bottom:
        (effect.dims[0] - effect.element.clientHeight) + 'px'
           });
       },
       afterFinishInternal: function(effect) {
           effect.element.hide().undoClipping().undoPositioned();
           effect.element.down().undoPositioned().setStyle({ bottom: oldInnerBottom });
       }
   }, arguments[1] || {})
  );
};

// Bug in opera makes the TD containing this element expand for a instance after finish 
Effect.Squish = function(element) {
    return new Effect.Scale(element, window.opera ? 1 : 0, {
        restoreAfterFinish: true,
        beforeSetup: function(effect) {
            effect.element.makeClipping();
        },
        afterFinishInternal: function(effect) {
            effect.element.hide().undoClipping();
        }
    });
};

Effect.Grow = function(element) {
    element = $(element);
    var options = Object.extend({
        direction: 'center',
        moveTransition: Effect.Transitions.sinoidal,
        scaleTransition: Effect.Transitions.sinoidal,
        opacityTransition: Effect.Transitions.full
    }, arguments[1] || {});
    var oldStyle = {
        top: element.style.top,
        left: element.style.left,
        height: element.style.height,
        width: element.style.width,
        opacity: element.getInlineOpacity()
    };

    var dims = element.getDimensions();
    var initialMoveX, initialMoveY;
    var moveX, moveY;

    switch (options.direction) {
        case 'top-left':
            initialMoveX = initialMoveY = moveX = moveY = 0;
            break;
        case 'top-right':
            initialMoveX = dims.width;
            initialMoveY = moveY = 0;
            moveX = -dims.width;
            break;
        case 'bottom-left':
            initialMoveX = moveX = 0;
            initialMoveY = dims.height;
            moveY = -dims.height;
            break;
        case 'bottom-right':
            initialMoveX = dims.width;
            initialMoveY = dims.height;
            moveX = -dims.width;
            moveY = -dims.height;
            break;
        case 'center':
            initialMoveX = dims.width / 2;
            initialMoveY = dims.height / 2;
            moveX = -dims.width / 2;
            moveY = -dims.height / 2;
            break;
    }

    return new Effect.Move(element, {
        x: initialMoveX,
        y: initialMoveY,
        duration: 0.01,
        beforeSetup: function(effect) {
            effect.element.hide().makeClipping().makePositioned();
        },
        afterFinishInternal: function(effect) {
            new Effect.Parallel(
        [new Effect.Opacity(effect.element, { sync: true, to: 1.0, from: 0.0, transition: options.opacityTransition }),
          new Effect.Move(effect.element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition }),
          new Effect.Scale(effect.element, 100, {
              scaleMode: { originalHeight: dims.height, originalWidth: dims.width },
              sync: true, scaleFrom: window.opera ? 1 : 0, transition: options.scaleTransition, restoreAfterFinish: true
          })
        ], Object.extend({
            beforeSetup: function(effect) {
                effect.effects[0].element.setStyle({ height: '0px' }).show();
            },
            afterFinishInternal: function(effect) {
                effect.effects[0].element.undoClipping().undoPositioned().setStyle(oldStyle);
            }
        }, options)
      )
        }
    });
};

Effect.Shrink = function(element) {
    element = $(element);
    var options = Object.extend({
        direction: 'center',
        moveTransition: Effect.Transitions.sinoidal,
        scaleTransition: Effect.Transitions.sinoidal,
        opacityTransition: Effect.Transitions.none
    }, arguments[1] || {});
    var oldStyle = {
        top: element.style.top,
        left: element.style.left,
        height: element.style.height,
        width: element.style.width,
        opacity: element.getInlineOpacity()
    };

    var dims = element.getDimensions();
    var moveX, moveY;

    switch (options.direction) {
        case 'top-left':
            moveX = moveY = 0;
            break;
        case 'top-right':
            moveX = dims.width;
            moveY = 0;
            break;
        case 'bottom-left':
            moveX = 0;
            moveY = dims.height;
            break;
        case 'bottom-right':
            moveX = dims.width;
            moveY = dims.height;
            break;
        case 'center':
            moveX = dims.width / 2;
            moveY = dims.height / 2;
            break;
    }

    return new Effect.Parallel(
    [new Effect.Opacity(element, { sync: true, to: 0.0, from: 1.0, transition: options.opacityTransition }),
      new Effect.Scale(element, window.opera ? 1 : 0, { sync: true, transition: options.scaleTransition, restoreAfterFinish: true }),
      new Effect.Move(element, { x: moveX, y: moveY, sync: true, transition: options.moveTransition })
    ], Object.extend({
        beforeStartInternal: function(effect) {
            effect.effects[0].element.makePositioned().makeClipping();
        },
        afterFinishInternal: function(effect) {
            effect.effects[0].element.hide().undoClipping().undoPositioned().setStyle(oldStyle);
        }
    }, options)
  );
};

Effect.Pulsate = function(element) {
    element = $(element);
    var options = arguments[1] || {};
    var oldOpacity = element.getInlineOpacity();
    var transition = options.transition || Effect.Transitions.sinoidal;
    var reverser = function(pos) { return transition(1 - Effect.Transitions.pulse(pos, options.pulses)) };
    reverser.bind(transition);
    return new Effect.Opacity(element,
    Object.extend(Object.extend({ duration: 2.0, from: 0,
        afterFinishInternal: function(effect) { effect.element.setStyle({ opacity: oldOpacity }); }
    }, options), { transition: reverser }));
};

Effect.Fold = function(element) {
    element = $(element);
    var oldStyle = {
        top: element.style.top,
        left: element.style.left,
        width: element.style.width,
        height: element.style.height
    };
    element.makeClipping();
    return new Effect.Scale(element, 5, Object.extend({
        scaleContent: false,
        scaleX: false,
        afterFinishInternal: function(effect) {
            new Effect.Scale(element, 1, {
                scaleContent: false,
                scaleY: false,
                afterFinishInternal: function(effect) {
                    effect.element.hide().undoClipping().setStyle(oldStyle);
                } 
            });
        } 
    }, arguments[1] || {}));
};

Effect.Morph = Class.create(Effect.Base, {
    initialize: function(element) {
        this.element = $(element);
        if (!this.element) throw (Effect._elementDoesNotExistError);
        var options = Object.extend({
            style: {}
        }, arguments[1] || {});

        if (!Object.isString(options.style)) this.style = $H(options.style);
        else {
            if (options.style.include(':'))
                this.style = options.style.parseStyle();
            else {
                this.element.addClassName(options.style);
                this.style = $H(this.element.getStyles());
                this.element.removeClassName(options.style);
                var css = this.element.getStyles();
                this.style = this.style.reject(function(style) {
                    return style.value == css[style.key];
                });
                options.afterFinishInternal = function(effect) {
                    effect.element.addClassName(effect.options.style);
                    effect.transforms.each(function(transform) {
                        effect.element.style[transform.style] = '';
                    });
                }
            }
        }
        this.start(options);
    },

    setup: function() {
        function parseColor(color) {
            if (!color || ['rgba(0, 0, 0, 0)', 'transparent'].include(color)) color = '#ffffff';
            color = color.parseColor();
            return $R(0, 2).map(function(i) {
                return parseInt(color.slice(i * 2 + 1, i * 2 + 3), 16)
            });
        }
        this.transforms = this.style.map(function(pair) {
            var property = pair[0], value = pair[1], unit = null;

            if (value.parseColor('#zzzzzz') != '#zzzzzz') {
                value = value.parseColor();
                unit = 'color';
            } else if (property == 'opacity') {
                value = parseFloat(value);
                if (Prototype.Browser.IE && (!this.element.currentStyle.hasLayout))
                    this.element.setStyle({ zoom: 1 });
            } else if (Element.CSS_LENGTH.test(value)) {
                var components = value.match(/^([\+\-]?[0-9\.]+)(.*)$/);
                value = parseFloat(components[1]);
                unit = (components.length == 3) ? components[2] : null;
            }

            var originalValue = this.element.getStyle(property);
            return {
                style: property.camelize(),
                originalValue: unit == 'color' ? parseColor(originalValue) : parseFloat(originalValue || 0),
                targetValue: unit == 'color' ? parseColor(value) : value,
                unit: unit
            };
        } .bind(this)).reject(function(transform) {
            return (
        (transform.originalValue == transform.targetValue) ||
        (
          transform.unit != 'color' &&
          (isNaN(transform.originalValue) || isNaN(transform.targetValue))
        )
      )
        });
    },
    update: function(position) {
        var style = {}, transform, i = this.transforms.length;
        while (i--)
            style[(transform = this.transforms[i]).style] =
        transform.unit == 'color' ? '#' +
          (Math.round(transform.originalValue[0] +
            (transform.targetValue[0] - transform.originalValue[0]) * position)).toColorPart() +
          (Math.round(transform.originalValue[1] +
            (transform.targetValue[1] - transform.originalValue[1]) * position)).toColorPart() +
          (Math.round(transform.originalValue[2] +
            (transform.targetValue[2] - transform.originalValue[2]) * position)).toColorPart() :
        (transform.originalValue +
          (transform.targetValue - transform.originalValue) * position).toFixed(3) +
            (transform.unit === null ? '' : transform.unit);
        this.element.setStyle(style, true);
    }
});

Effect.Transform = Class.create({
    initialize: function(tracks) {
        this.tracks = [];
        this.options = arguments[1] || {};
        this.addTracks(tracks);
    },
    addTracks: function(tracks) {
        tracks.each(function(track) {
            track = $H(track);
            var data = track.values().first();
            this.tracks.push($H({
                ids: track.keys().first(),
                effect: Effect.Morph,
                options: { style: data }
            }));
        } .bind(this));
        return this;
    },
    play: function() {
        return new Effect.Parallel(
      this.tracks.map(function(track) {
          var ids = track.get('ids'), effect = track.get('effect'), options = track.get('options');
          var elements = [$(ids) || $$(ids)].flatten();
          return elements.map(function(e) { return new effect(e, Object.extend({ sync: true }, options)) });
      }).flatten(),
      this.options
    );
    }
});

Element.CSS_PROPERTIES = $w(
  'backgroundColor backgroundPosition borderBottomColor borderBottomStyle ' +
  'borderBottomWidth borderLeftColor borderLeftStyle borderLeftWidth ' +
  'borderRightColor borderRightStyle borderRightWidth borderSpacing ' +
  'borderTopColor borderTopStyle borderTopWidth bottom clip color ' +
  'fontSize fontWeight height left letterSpacing lineHeight ' +
  'marginBottom marginLeft marginRight marginTop markerOffset maxHeight ' +
  'maxWidth minHeight minWidth opacity outlineColor outlineOffset ' +
  'outlineWidth paddingBottom paddingLeft paddingRight paddingTop ' +
  'right textIndent top width wordSpacing zIndex');

Element.CSS_LENGTH = /^(([\+\-]?[0-9\.]+)(em|ex|px|in|cm|mm|pt|pc|\%))|0$/;

String.__parseStyleElement = document.createElement('div');
String.prototype.parseStyle = function() {
    var style, styleRules = $H();
    if (Prototype.Browser.WebKit)
        style = new Element('div', { style: this }).style;
    else {
        String.__parseStyleElement.innerHTML = '<div style="' + this + '"></div>';
        style = String.__parseStyleElement.childNodes[0].style;
    }

    Element.CSS_PROPERTIES.each(function(property) {
        if (style[property]) styleRules.set(property, style[property]);
    });

    if (Prototype.Browser.IE && this.include('opacity'))
        styleRules.set('opacity', this.match(/opacity:\s*((?:0|1)?(?:\.\d*)?)/)[1]);

    return styleRules;
};

if (document.defaultView && document.defaultView.getComputedStyle) {
    Element.getStyles = function(element) {
        var css = document.defaultView.getComputedStyle($(element), null);
        return Element.CSS_PROPERTIES.inject({}, function(styles, property) {
            styles[property] = css[property];
            return styles;
        });
    };
} else {
    Element.getStyles = function(element) {
        element = $(element);
        var css = element.currentStyle, styles;
        styles = Element.CSS_PROPERTIES.inject({}, function(results, property) {
            results[property] = css[property];
            return results;
        });
        if (!styles.opacity) styles.opacity = element.getOpacity();
        return styles;
    };
};

Effect.Methods = {
    morph: function(element, style) {
        element = $(element);
        new Effect.Morph(element, Object.extend({ style: style }, arguments[2] || {}));
        return element;
    },
    visualEffect: function(element, effect, options) {
        element = $(element)


        var s = effect.dasherize().camelize(), klass = s.charAt(0).toUpperCase() + s.substring(1);
        new Effect[klass](element, options);
        return element;
    },
    highlight: function(element, options) {
        element = $(element);
        new Effect.Highlight(element, options);
        return element;
    }
};

$w('fade appear grow shrink fold blindUp blindDown slideUp slideDown ' +
  'pulsate shake puff squish switchOff dropOut').each(
  function(effect) {
      Effect.Methods[effect] = function(element, options) {
          element = $(element);
          Effect[effect.charAt(0).toUpperCase() + effect.substring(1)](element, options);
          return element;
      }
  }
);

$w('getInlineOpacity forceRerendering setContentZoom collectTextNodes collectTextNodesIgnoreClass getStyles').each(
  function(f) { Effect.Methods[f] = Element[f]; }
);

Element.addMethods(Effect.Methods);

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////


// script.aculo.us builder.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Thomas Fuchs (http://script.aculo.us, http://mir.aculo.us)
//
// script.aculo.us is freely distributable under the terms of an MIT-style license.
// For details, see the script.aculo.us web site: http://script.aculo.us/

var Builder = {
    NODEMAP: {
        AREA: 'map',
        CAPTION: 'table',
        COL: 'table',
        COLGROUP: 'table',
        LEGEND: 'fieldset',
        OPTGROUP: 'select',
        OPTION: 'select',
        PARAM: 'object',
        TBODY: 'table',
        TD: 'table',
        TFOOT: 'table',
        TH: 'table',
        THEAD: 'table',
        TR: 'table'
    },
    // note: For Firefox < 1.5, OPTION and OPTGROUP tags are currently broken,
    //       due to a Firefox bug
    node: function(elementName) {
        elementName = elementName.toUpperCase();

        // try innerHTML approach
        var parentTag = this.NODEMAP[elementName] || 'div';
        var parentElement = document.createElement(parentTag);
        try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
            parentElement.innerHTML = "<" + elementName + "></" + elementName + ">";
        } catch (e) { }
        var element = parentElement.firstChild || null;

        // see if browser added wrapping tags
        if (element && (element.tagName.toUpperCase() != elementName))
            element = element.getElementsByTagName(elementName)[0];

        // fallback to createElement approach
        if (!element) element = document.createElement(elementName);

        // abort if nothing could be created
        if (!element) return;

        // attributes (or text)
        if (arguments[1])
            if (this._isStringOrNumber(arguments[1]) ||
        (arguments[1] instanceof Array) ||
        arguments[1].tagName) {
            this._children(element, arguments[1]);
        } else {
            var attrs = this._attributes(arguments[1]);
            if (attrs.length) {
                try { // prevent IE "feature": http://dev.rubyonrails.org/ticket/2707
                    parentElement.innerHTML = "<" + elementName + " " +
                attrs + "></" + elementName + ">";
                } catch (e) { }
                element = parentElement.firstChild || null;
                // workaround firefox 1.0.X bug
                if (!element) {
                    element = document.createElement(elementName);
                    for (attr in arguments[1])
                        element[attr == 'class' ? 'className' : attr] = arguments[1][attr];
                }
                if (element.tagName.toUpperCase() != elementName)
                    element = parentElement.getElementsByTagName(elementName)[0];
            }
        }

        // text, or array of children
        if (arguments[2])
            this._children(element, arguments[2]);

        return element;
    },
    _text: function(text) {
        return document.createTextNode(text);
    },

    ATTR_MAP: {
        'className': 'class',
        'htmlFor': 'for'
    },

    _attributes: function(attributes) {
        var attrs = [];
        for (attribute in attributes)
            attrs.push((attribute in this.ATTR_MAP ? this.ATTR_MAP[attribute] : attribute) +
          '="' + attributes[attribute].toString().escapeHTML().gsub(/"/, '&quot;') + '"');
        return attrs.join(" ");
    },
    _children: function(element, children) {
        if (children.tagName) {
            element.appendChild(children);
            return;
        }
        if (typeof children == 'object') { // array can hold nodes and text
            children.flatten().each(function(e) {
                if (typeof e == 'object')
                    element.appendChild(e)
                else
                    if (Builder._isStringOrNumber(e))
                    element.appendChild(Builder._text(e));
            });
        } else
            if (Builder._isStringOrNumber(children))
            element.appendChild(Builder._text(children));
    },
    _isStringOrNumber: function(param) {
        return (typeof param == 'string' || typeof param == 'number');
    },
    build: function(html) {
        var element = this.node('div');
        $(element).update(html.strip());
        return element.down();
    },
    dump: function(scope) {
        if (typeof scope != 'object' && typeof scope != 'function') scope = window; //global scope 

        var tags = ("A ABBR ACRONYM ADDRESS APPLET AREA B BASE BASEFONT BDO BIG BLOCKQUOTE BODY " +
      "BR BUTTON CAPTION CENTER CITE CODE COL COLGROUP DD DEL DFN DIR DIV DL DT EM FIELDSET " +
      "FONT FORM FRAME FRAMESET H1 H2 H3 H4 H5 H6 HEAD HR HTML I IFRAME IMG INPUT INS ISINDEX " +
      "KBD LABEL LEGEND LI LINK MAP MENU META NOFRAMES NOSCRIPT OBJECT OL OPTGROUP OPTION P " +
      "PARAM PRE Q S SAMP SCRIPT SELECT SMALL SPAN STRIKE STRONG STYLE SUB SUP TABLE TBODY TD " +
      "TEXTAREA TFOOT TH THEAD TITLE TR TT U UL VAR").split(/\s+/);

        tags.each(function(tag) {
            scope[tag] = function() {
                return Builder.node.apply(Builder, [tag].concat($A(arguments)));
            }
        });
    }
}


///////////////////////////////////////////////////////////////////////////////////////////////////////////


// -----------------------------------------------------------------------------------
//
//	Lightbox v2.04
//	by Lokesh Dhakar - http://www.lokeshdhakar.com
//	Last Modification: 2/9/08
//
//	For more information, visit:
//	http://lokeshdhakar.com/projects/lightbox2/
//
//	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
//  	- Free for use in both personal and commercial projects
//		- Attribution requires leaving author name, author link, and the license info intact.
//	
//  Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
//  		Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
//
// -----------------------------------------------------------------------------------
/*

Table of Contents
-----------------
Configuration

Lightbox Class Declaration
- initialize()
- updateImageList()
- start()
- changeImage()
- resizeImageContainer()
- showImage()
- updateDetails()
- updateNav()
- enableKeyboardNav()
- disableKeyboardNav()
- keyboardAction()
- preloadNeighborImages()
- end()
    
Function Calls
- document.observe()
   
*/
// -----------------------------------------------------------------------------------

//
//  Configurationl
//
LightboxOptions = Object.extend({
    fileLoadingImage: 'imagens/loading.gif',
    fileBottomNavCloseImage: 'imagens/fechar.gif',

    overlayOpacity: 0.4,   // controls transparency of shadow overlay

    animate: true,         // toggles resizing animations
    resizeSpeed: 7,        // controls the speed of the image resizing animations (1=slowest and 10=fastest)

    borderSize: 10,         //if you adjust the padding in the CSS, you will need to update this variable

    // When grouping images this is used to write: Image # of #.
    // Change it for non-english localization
    labelImage: "Foto",
    labelOf: "de"
}, window.LightboxOptions || {});

// -----------------------------------------------------------------------------------

var Lightbox = Class.create();

Lightbox.prototype = {
    imageArray: [],
    activeImage: undefined,

    // initialize()
    // Constructor runs on completion of the DOM loading. Calls updateImageList and then
    // the function inserts html at the bottom of the page which is used to display the shadow 
    // overlay and the image container.
    //
    initialize: function() {

        this.updateImageList();

        this.keyboardAction = this.keyboardAction.bindAsEventListener(this);

        if (LightboxOptions.resizeSpeed > 10) LightboxOptions.resizeSpeed = 10;
        if (LightboxOptions.resizeSpeed < 1) LightboxOptions.resizeSpeed = 1;

        this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
        this.overlayDuration = LightboxOptions.animate ? 0.2 : 0;  // shadow fade in/out duration

        // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
        // If animations are turned off, it will be hidden as to prevent a flicker of a
        // white 250 by 250 box.
        var size = (LightboxOptions.animate ? 250 : 1) + 'px';


        // Code inserts html at the bottom of the page that looks similar to this:
        //
        //  <div id="overlay"></div>
        //  <div id="lightbox">
        //      <div id="outerImageContainer">
        //          <div id="imageContainer">
        //              <img id="lightboxImage">
        //              <div style="" id="hoverNav">
        //                  <a href="#" id="prevLink"></a>
        //                  <a href="#" id="nextLink"></a>
        //              </div>
        //              <div id="loading">
        //                  <a href="#" id="loadingLink">
        //                      <img src="images/loading.gif">
        //                  </a>
        //              </div>
        //          </div>
        //      </div>
        //      <div id="imageDataContainer">
        //          <div id="imageData">
        //              <div id="imageDetails">
        //                  <span id="caption"></span>
        //                  <span id="numberDisplay"></span>
        //              </div>
        //              <div id="bottomNav">
        //                  <a href="#" id="bottomNavClose">
        //                      <img src="images/close.gif">
        //                  </a>
        //              </div>
        //          </div>
        //      </div>
        //  </div>


        var objBody = $$('body')[0];

        objBody.appendChild(Builder.node('div', { id: 'overlay' }));

        objBody.appendChild(Builder.node('div', { id: 'lightbox' }, [
            Builder.node('div', { id: 'outerImageContainer' },
                Builder.node('div', { id: 'imageContainer' }, [
                    Builder.node('img', { id: 'lightboxImage' }),
                    Builder.node('div', { id: 'hoverNav' }, [
                        Builder.node('a', { id: 'prevLink', href: '#' }),
                        Builder.node('a', { id: 'nextLink', href: '#' })
                    ]),
                    Builder.node('div', { id: 'loading' },
                        Builder.node('a', { id: 'loadingLink', href: '#' },
                            Builder.node('img', { src: LightboxOptions.fileLoadingImage })
                        )
                    )
                ])
            ),
            Builder.node('div', { id: 'imageDataContainer' },
                Builder.node('div', { id: 'imageData' }, [
                    Builder.node('div', { id: 'imageDetails' }, [
                        Builder.node('span', { id: 'caption' }),
                        Builder.node('span', { id: 'numberDisplay' })
                    ]),
                    Builder.node('div', { id: 'bottomNav' },
                        Builder.node('a', { id: 'bottomNavClose', href: '#' },
                            Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
                        )
                    )
                ])
            )
        ]));


        $('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
        $('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
        $('outerImageContainer').setStyle({ width: size, height: size });
        $('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
        $('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
        $('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
        $('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));

        var th = this;
        (function() {
            var ids =
                'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' +
                'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose';
            $w(ids).each(function(id) { th[id] = $(id); });
        }).defer();
    },

    //
    // updateImageList()
    // Loops through anchor tags looking for 'lightbox' references and applies onclick
    // events to appropriate links. You can rerun after dynamically adding images w/ajax.
    //
    updateImageList: function() {
        this.updateImageList = Prototype.emptyFunction;

        document.observe('click', (function(event) {
            var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
            if (target) {
                event.stop();
                this.start(target);
            }
        }).bind(this));
    },

    //
    //  start()
    //  Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
    //
    start: function(imageLink) {

        $$('select', 'object', 'embed').each(function(node) { node.style.visibility = 'hidden' });

        // stretch overlay to fill page and fade in
        var arrayPageSize = this.getPageSize();
        $('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });

        new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });

        this.imageArray = [];
        var imageNum = 0;

        if ((imageLink.rel == 'lightbox')) {
            // if image is NOT part of a set, add single image to imageArray
            this.imageArray.push([imageLink.href, imageLink.title]);
        } else {
            // if image is part of a set..
            this.imageArray =
                $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
                collect(function(anchor) { return [anchor.href, anchor.title]; }).
                uniq();

            while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
        }

        // calculate top and left offset for the lightbox 
        var arrayPageScroll = document.viewport.getScrollOffsets();
        var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 6);
        //        var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
        var lightboxLeft = arrayPageScroll[0];
        this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();

        this.changeImage(imageNum);
    },

    //
    //  changeImage()
    //  Hide most elements and preload image in preparation for resizing image container.
    //
    changeImage: function(imageNum) {

        this.activeImage = imageNum; // update global var

        // hide elements during transition
        if (LightboxOptions.animate) this.loading.show();
        this.lightboxImage.hide();
        this.hoverNav.hide();
        this.prevLink.hide();
        this.nextLink.hide();
        // HACK: Opera9 does not currently support scriptaculous opacity and appear fx
        this.imageDataContainer.setStyle({ opacity: .0001 });
        this.numberDisplay.hide();

        var imgPreloader = new Image();

        // once image is preloaded, resize image container


        imgPreloader.onload = (function() {
            this.lightboxImage.src = this.imageArray[this.activeImage][0];
            this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
        }).bind(this);
        imgPreloader.src = this.imageArray[this.activeImage][0];
    },

    //
    //  resizeImageContainer()
    //
    resizeImageContainer: function(imgWidth, imgHeight) {

        // get current width and height
        var widthCurrent = this.outerImageContainer.getWidth();
        var heightCurrent = this.outerImageContainer.getHeight();

        // get new width and height
        var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
        var heightNew = (imgHeight + LightboxOptions.borderSize * 2);

        // scalars based on change from old to new
        var xScale = (widthNew / widthCurrent) * 100;
        var yScale = (heightNew / heightCurrent) * 100;

        // calculate size difference between new and old image, and resize if necessary
        var wDiff = widthCurrent - widthNew;
        var hDiff = heightCurrent - heightNew;

        if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, { scaleX: false, duration: this.resizeDuration, queue: 'front' });
        if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, { scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration });

        // if new and old image are same size and no scaling transition is necessary, 
        // do a quick pause to prevent image flicker.
        var timeout = 0;
        if ((hDiff == 0) && (wDiff == 0)) {
            timeout = 100;
            if (Prototype.Browser.IE) timeout = 250;
        }

        (function() {
            this.prevLink.setStyle({ height: imgHeight + 'px' });
            this.nextLink.setStyle({ height: imgHeight + 'px' });
            this.imageDataContainer.setStyle({ width: widthNew + 'px' });

            this.showImage();
        }).bind(this).delay(timeout / 1000);
    },

    //
    //  showImage()
    //  Display image and begin preloading neighbors.
    //
    showImage: function() {
        this.loading.hide();
        new Effect.Appear(this.lightboxImage, {
            duration: this.resizeDuration,
            queue: 'end',
            afterFinish: (function() { this.updateDetails(); }).bind(this)
        });
        this.preloadNeighborImages();
    },

    //
    //  updateDetails()
    //  Display caption, image number, and bottom nav.
    //
    updateDetails: function() {

        // if caption is not null
        if (this.imageArray[this.activeImage][1] != "") {
            this.caption.update(this.imageArray[this.activeImage][1]).show();
        }

        // if image is part of set display 'Image x of x' 
        if (this.imageArray.length > 1) {
            this.numberDisplay.update(LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + '  ' + this.imageArray.length).show();
        }

        new Effect.Parallel(
            [
                new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }),
                new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration })
            ],
            {
                duration: this.resizeDuration,
                afterFinish: (function() {
                    // update overlay size and update nav
                    var arrayPageSize = this.getPageSize();
                    this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
                    this.updateNav();
                }).bind(this)
            }
        );
    },

    //
    //  updateNav()
    //  Display appropriate previous and next hover navigation.
    //
    updateNav: function() {

        this.hoverNav.show();

        // if not first image in set, display prev image button
        if (this.activeImage > 0) this.prevLink.show();

        // if not last image in set, display next image button
        if (this.activeImage < (this.imageArray.length - 1)) this.nextLink.show();

        this.enableKeyboardNav();
    },

    //
    //  enableKeyboardNav()
    //
    enableKeyboardNav: function() {
        document.observe('keydown', this.keyboardAction);
    },

    //
    //  disableKeyboardNav()
    //
    disableKeyboardNav: function() {
        document.stopObserving('keydown', this.keyboardAction);
    },

    //
    //  keyboardAction()
    //
    keyboardAction: function(event) {
        var keycode = event.keyCode;

        var escapeKey;
        if (event.DOM_VK_ESCAPE) {  // mozilla
            escapeKey = event.DOM_VK_ESCAPE;
        } else { // ie
            escapeKey = 27;
        }

        var key = String.fromCharCode(keycode).toLowerCase();

        if (key.match(/x|o|c/) || (keycode == escapeKey)) { // close lightbox
            this.end();
        } else if ((key == 'p') || (keycode == 37)) { // display previous image
            if (this.activeImage != 0) {
                this.disableKeyboardNav();
                this.changeImage(this.activeImage - 1);
            }
        } else if ((key == 'n') || (keycode == 39)) { // display next image
            if (this.activeImage != (this.imageArray.length - 1)) {
                this.disableKeyboardNav();
                this.changeImage(this.activeImage + 1);
            }
        }
    },

    //
    //  preloadNeighborImages()
    //  Preload previous and next images.
    //
    preloadNeighborImages: function() {
        var preloadNextImage, preloadPrevImage;
        if (this.imageArray.length > this.activeImage + 1) {
            preloadNextImage = new Image();
            preloadNextImage.src = this.imageArray[this.activeImage + 1][0];
        }
        if (this.activeImage > 0) {
            preloadPrevImage = new Image();
            preloadPrevImage.src = this.imageArray[this.activeImage - 1][0];
        }

    },

    //
    //  end()
    //
    end: function() {
        this.disableKeyboardNav();
        this.lightbox.hide();
        new Effect.Fade(this.overlay, { duration: this.overlayDuration });
        $$('select', 'object', 'embed').each(function(node) { node.style.visibility = 'visible' });
    },

    //
    //  getPageSize()
    //
    getPageSize: function() {

        var xScroll, yScroll;

        if (window.innerHeight && window.scrollMaxY) {
            xScroll = window.innerWidth + window.scrollMaxX;
            yScroll = window.innerHeight + window.scrollMaxY;
        } else if (document.body.scrollHeight > document.body.offsetHeight) { // all but Explorer Mac
            xScroll = document.body.scrollWidth;
            yScroll = document.body.scrollHeight;
        } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
            xScroll = document.body.offsetWidth;
            yScroll = document.body.offsetHeight;
        }

        var windowWidth, windowHeight;

        if (self.innerHeight) {	// all except Explorer
            if (document.documentElement.clientWidth) {
                windowWidth = document.documentElement.clientWidth;
            } else {
                windowWidth = self.innerWidth;
            }
            windowHeight = self.innerHeight;
        } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
            windowWidth = document.documentElement.clientWidth;
            windowHeight = document.documentElement.clientHeight;
        } else if (document.body) { // other Explorers
            windowWidth = document.body.clientWidth;
            windowHeight = document.body.clientHeight;
        }

        // for small pages with total height less then height of the viewport
        if (yScroll < windowHeight) {
            pageHeight = windowHeight;
        } else {
            pageHeight = yScroll;
        }

        // for small pages with total width less then width of the viewport
        if (xScroll < windowWidth) {
            pageWidth = xScroll;
        } else {
            pageWidth = windowWidth;
        }

        return [pageWidth, pageHeight];
    }
}

document.observe('dom:loaded', function() { new Lightbox(); });