/*  Prototype JavaScript framework, version 1.4.0
*  (c) 2005 Sam Stephenson <sam@conio.net>
*
*  THIS FILE IS AUTOMATICALLY GENERATED. When sending patches, please diff
*  against the source tree, available from the Prototype darcs repository.
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*
*  For details, see the Prototype web site: http://prototype.conio.net/
*
/*--------------------------------------------------------------------------*/

var Prototype = {
    Version: '1.4.0',
    ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

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

var Class = {
    create: function() {
        return function() {
            this.initialize.apply(this, arguments);
        }
    }
}

var Abstract = new Object();

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

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

Function.prototype.bind = function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
        return __method.apply(object, args.concat($A(arguments)));
    }
}

Function.prototype.bindAsEventListener = function(object) {
    var __method = this;
    return function(event) {
        return __method.call(object, event || window.event);
    }
}

Object.extend(Number.prototype, {
    toColorPart: function() {
        var digits = this.toString(16);
        if (this < 16) return '0' + digits;
        return digits;
    },

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

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

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

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

        return returnValue;
    }
}

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

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

        this.registerCallback();
    },

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

    onTimerEvent: function() {
        if (!this.currentlyExecuting) {
            try {
                this.currentlyExecuting = true;
                this.callback();
            } finally {
                this.currentlyExecuting = false;
            }
        }
    }
}

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

function $() {
    var elements = new Array();

    for (var i = 0; i < arguments.length; i++) {
        var element = arguments[i];
        if (typeof element == 'string')
            element = document.getElementById(element);

        if (arguments.length == 1)
            return element;

        elements.push(element);
    }

    return elements;
}
Object.extend(String.prototype, {
    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(eval);
    },

    escapeHTML: function() {
        var div = document.createElement('div');
        var text = document.createTextNode(this);
        div.appendChild(text);
        return div.innerHTML;
    },

    unescapeHTML: function() {
        var div = document.createElement('div');
        div.innerHTML = this.stripTags();
        return div.childNodes[0] ? div.childNodes[0].nodeValue : '';
    },

    toQueryParams: function() {
        var pairs = this.match(/^\??(.*)$/)[1].split('&');
        return pairs.inject({}, function(params, pairString) {
            var pair = pairString.split('=');
            params[pair[0]] = pair[1];
            return params;
        });
    },

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

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

        var camelizedString = this.indexOf('-') == 0
      ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
      : oStringList[0];

        for (var i = 1, len = oStringList.length; i < len; i++) {
            var s = oStringList[i];
            camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
        }

        return camelizedString;
    },

    inspect: function() {
        return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
    }
});

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

var $break = new Object();
var $continue = new Object();

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

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

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

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

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

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

    grep: function(pattern, iterator) {
        var results = [];
        this.each(function(value, index) {
            var stringValue = value.toString();
            if (stringValue.match(pattern))
                results.push((iterator || Prototype.K)(value, index));
        })
        return results;
    },

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

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

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

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

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

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

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

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

    sortBy: function(iterator) {
        return this.collect(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.collect(Prototype.K);
    },

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

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

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

Object.extend(Enumerable, {
    map: Enumerable.collect,
    find: Enumerable.detect,
    select: Enumerable.findAll,
    member: Enumerable.include,
    entries: Enumerable.toArray
});
var $A = Array.from = function(iterable) {
    if (!iterable) return [];
    if (iterable.toArray) {
        return iterable.toArray();
    } else {
        var results = [];
        for (var i = 0; i < iterable.length; i++)
            results.push(iterable[i]);
        return results;
    }
}

Object.extend(Array.prototype, Enumerable);

Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
    _each: function(iterator) {
        for (var i = 0; i < this.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 != undefined || value != null;
        });
    },

    flatten: function() {
        return this.inject([], function(array, value) {
            return array.concat(value.constructor == Array ?
        value.flatten() : [value]);
        });
    },

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

    indexOf: function(object) {
        for (var i = 0; i < this.length; i++)
            if (this[i] == object) return i;
        return -1;
    },

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

    shift: function() {
        var result = this[0];
        for (var i = 0; i < this.length - 1; i++)
            this[i] = this[i + 1];
        if (this.length > 0)
            this.length--;
        return result;
    },

    inspect: function() {
        return '[' + this.map(Object.inspect).join(', ') + ']';
    }
});
var Hash = {
    _each: function(iterator) {
        for (key in this) {
            var value = this[key];
            if (typeof value == 'function') continue;

            var pair = [key, value];
            pair.key = key;
            pair.value = value;
            iterator(pair);
        }
    },

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

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

    merge: function(hash) {
        return $H(hash).inject($H(this), function(mergedHash, pair) {
            mergedHash[pair.key] = pair.value;
            return mergedHash;
        });
    },

    toQueryString: function() {
        return this.map(function(pair) {
            return pair.map(encodeURIComponent).join('=');
        }).join('&');
    },

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

function $H(object) {
    var hash = Object.extend({}, object || {});
    Object.extend(hash, Enumerable);
    Object.extend(hash, Hash);
    return hash;
}
ObjectRange = Class.create();
Object.extend(ObjectRange.prototype, Enumerable);
Object.extend(ObjectRange.prototype, {
    initialize: function(start, end, exclusive) {
        this.start = start;
        this.end = end;
        this.exclusive = exclusive;
    },

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

    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 ActiveXObject('Msxml2.XMLHTTP') },
      function() { return new ActiveXObject('Microsoft.XMLHTTP') },
      function() { return new XMLHttpRequest() }
    ) || false;
    },

    activeRequestCount: 0
}

Ajax.Responders = {
    responders: [],

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

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

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

    dispatch: function(callback, request, transport, json) {
        this.each(function(responder) {
            if (responder[callback] && typeof responder[callback] == 'function') {
                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 = function() { };
Ajax.Base.prototype = {
    setOptions: function(options) {
        this.options = {
            method: 'post',
            asynchronous: true,
            parameters: ''
        }
        Object.extend(this.options, options || {});
    },

    responseIsSuccess: function() {
        return this.transport.status == undefined
        || this.transport.status == 0
        || (this.transport.status >= 200 && this.transport.status < 300);
    },

    responseIsFailure: function() {
        return !this.responseIsSuccess();
    }
}

Ajax.Request = Class.create();
Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
    initialize: function(url, options) {
        this.transport = Ajax.getTransport();
        this.setOptions(options);
        this.request(url);
    },

    request: function(url) {
        var parameters = this.options.parameters || '';
        if (parameters.length > 0) parameters += '&_=';

        try {
            this.url = url;
            if (this.options.method == 'get' && parameters.length > 0)
                this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

            Ajax.Responders.dispatch('onCreate', this, this.transport);

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

            if (this.options.asynchronous) {
                this.transport.onreadystatechange = this.onStateChange.bind(this);
                setTimeout((function() { this.respondToReadyState(1) }).bind(this), 10);
            }

            this.setRequestHeaders();

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

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

    setRequestHeaders: function() {
        var requestHeaders =
      ['X-Requested-With', 'XMLHttpRequest',
       'X-Prototype-Version', Prototype.Version];

        if (this.options.method == 'post') {
            requestHeaders.push('Content-type',
        'application/x-www-form-urlencoded');

            /* Force "Connection: close" for Mozilla browsers to work around
            * a bug where XMLHttpReqeuest sends an incorrect Content-length
            * header. See Mozilla Bugzilla #246651.
            */
            if (this.transport.overrideMimeType)
                requestHeaders.push('Connection', 'close');
        }

        if (this.options.requestHeaders)
            requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);

        for (var i = 0; i < requestHeaders.length; i += 2)
            this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i + 1]);
    },

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

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

    evalJSON: function() {
        try {
            return eval(this.header('X-JSON'));
        } catch (e) { }
    },

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

    respondToReadyState: function(readyState) {
        var event = Ajax.Request.Events[readyState];
        var transport = this.transport, json = this.evalJSON();

        if (event == 'Complete') {
            try {
                (this.options['on' + this.transport.status]
         || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(transport, json);
            } catch (e) {
                this.dispatchException(e);
            }

            if ((this.header('Content-type') || '').match(/^text\/javascript/i))
                this.evalResponse();
        }

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

        /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
        if (event == 'Complete')
            this.transport.onreadystatechange = Prototype.emptyFunction;
    },

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

Ajax.Updater = Class.create();

Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {
    initialize: function(container, url, options) {
        this.containers = {
            success: container.success ? $(container.success) : $(container),
            failure: container.failure ? $(container.failure) :
        (container.success ? null : $(container))
        }

        this.transport = Ajax.getTransport();
        this.setOptions(options);

        var onComplete = this.options.onComplete || Prototype.emptyFunction;
        this.options.onComplete = (function(transport, object) {
            this.updateContent();
            onComplete(transport, object);
        }).bind(this);

        this.request(url);
    },

    updateContent: function() {
        var receiver = this.responseIsSuccess() ?
      this.containers.success : this.containers.failure;
        var response = this.transport.responseText;

        if (!this.options.evalScripts)
            response = response.stripScripts();

        if (receiver) {
            if (this.options.insertion) {
                new this.options.insertion(receiver, response);
            } else {
                Element.update(receiver, response);
            }
        }

        if (this.responseIsSuccess()) {
            if (this.onComplete)
                setTimeout(this.onComplete.bind(this), 10);
        }
    }
});

Ajax.PeriodicalUpdater = Class.create();
Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {
    initialize: function(container, url, options) {
        this.setOptions(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.onComplete = undefined;
        clearTimeout(this.timer);
        (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
    },

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

            this.lastText = request.responseText;
        }
        this.timer = setTimeout(this.onTimerEvent.bind(this),
      this.decay * this.frequency * 1000);
    },

    onTimerEvent: function() {
        this.updater = new Ajax.Updater(this.container, this.url, this.options);
    }
});
document.getElementsByClassName = function(className, parentElement) {
    var children = ($(parentElement) || document.body).getElementsByTagName('*');
    return $A(children).inject([], function(elements, child) {
        if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
            elements.push(child);
        return elements;
    });
}

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

if (!window.Element) {
    var Element = new Object();
}

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

    toggle: function() {
        for (var i = 0; i < arguments.length; i++) {
            var element = $(arguments[i]);
            Element[Element.visible(element) ? 'hide' : 'show'](element);
        }
    },

    hide: function() {
        for (var i = 0; i < arguments.length; i++) {
            var element = $(arguments[i]);
            element.style.display = 'none';
        }
    },

    show: function() {
        for (var i = 0; i < arguments.length; i++) {
            var element = $(arguments[i]);
            element.style.display = '';
        }
    },

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

    update: function(element, html) {
        $(element).innerHTML = html.stripScripts();
        setTimeout(function() { html.evalScripts() }, 10);
    },

    getHeight: function(element) {
        element = $(element);
        return element.offsetHeight;
    },

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

    hasClassName: function(element, className) {
        if (!(element = $(element))) return;
        return Element.classNames(element).include(className);
    },

    addClassName: function(element, className) {
        if (!(element = $(element))) return;
        return Element.classNames(element).add(className);
    },

    removeClassName: function(element, className) {
        if (!(element = $(element))) return;
        return Element.classNames(element).remove(className);
    },

    // removes whitespace-only text node children
    cleanWhitespace: function(element) {
        element = $(element);
        for (var i = 0; i < element.childNodes.length; i++) {
            var node = element.childNodes[i];
            if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
                Element.remove(node);
        }
    },

    empty: function(element) {
        return $(element).innerHTML.match(/^\s*$/);
    },

    scrollTo: function(element) {
        element = $(element);
        var x = element.x ? element.x : element.offsetLeft,
        y = element.y ? element.y : element.offsetTop;
        window.scrollTo(x, y);
    },

    getStyle: function(element, style) {
        element = $(element);
        var value = element.style[style.camelize()];
        if (!value) {
            if (document.defaultView && document.defaultView.getComputedStyle) {
                var css = document.defaultView.getComputedStyle(element, null);
                value = css ? css.getPropertyValue(style) : null;
            } else if (element.currentStyle) {
                value = element.currentStyle[style.camelize()];
            }
        }

        if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
            if (Element.getStyle(element, 'position') == 'static') value = 'auto';

        return value == 'auto' ? null : value;
    },

    setStyle: function(element, style) {
        element = $(element);
        for (name in style)
            element.style[name.camelize()] = style[name];
    },

    getDimensions: function(element) {
        element = $(element);
        if (Element.getStyle(element, 'display') != 'none')
            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;
        els.visibility = 'hidden';
        els.position = 'absolute';
        els.display = '';
        var originalWidth = element.clientWidth;
        var originalHeight = element.clientHeight;
        els.display = 'none';
        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;
            }
        }
    },

    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 = '';
        }
    },

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

    undoClipping: function(element) {
        element = $(element);
        if (element._overflow) return;
        element.style.overflow = element._overflow;
        element._overflow = undefined;
    }
});

var Toggle = new Object();
Toggle.display = Element.toggle;

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

Abstract.Insertion = function(adjacency) {
    this.adjacency = adjacency;
}

Abstract.Insertion.prototype = {
    initialize: function(element, content) {
        this.element = $(element);
        this.content = content.stripScripts();

        if (this.adjacency && this.element.insertAdjacentHTML) {
            try {
                this.element.insertAdjacentHTML(this.adjacency, this.content);
            } catch (e) {
                if (this.element.tagName.toLowerCase() == 'tbody') {
                    this.insertContent(this.contentFromAnonymousTable());
                } else {
                    throw e;
                }
            }
        } else {
            this.range = this.element.ownerDocument.createRange();
            if (this.initializeRange) this.initializeRange();
            this.insertContent([this.range.createContextualFragment(this.content)]);
        }

        setTimeout(function() { content.evalScripts() }, 10);
    },

    contentFromAnonymousTable: function() {
        var div = document.createElement('div');
        div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';
        return $A(div.childNodes[0].childNodes[0].childNodes);
    }
}

var Insertion = new Object();

Insertion.Before = Class.create();
Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {
    initializeRange: function() {
        this.range.setStartBefore(this.element);
    },

    insertContent: function(fragments) {
        fragments.each((function(fragment) {
            this.element.parentNode.insertBefore(fragment, this.element);
        }).bind(this));
    }
});

Insertion.Top = Class.create();
Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {
    initializeRange: function() {
        this.range.selectNodeContents(this.element);
        this.range.collapse(true);
    },

    insertContent: function(fragments) {
        fragments.reverse(false).each((function(fragment) {
            this.element.insertBefore(fragment, this.element.firstChild);
        }).bind(this));
    }
});

Insertion.Bottom = Class.create();
Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {
    initializeRange: function() {
        this.range.selectNodeContents(this.element);
        this.range.collapse(this.element);
    },

    insertContent: function(fragments) {
        fragments.each((function(fragment) {
            this.element.appendChild(fragment);
        }).bind(this));
    }
});

Insertion.After = Class.create();
Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {
    initializeRange: function() {
        this.range.setStartAfter(this.element);
    },

    insertContent: function(fragments) {
        fragments.each((function(fragment) {
            this.element.parentNode.insertBefore(fragment,
        this.element.nextSibling);
        }).bind(this));
    }
});

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

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(this.toArray().concat(classNameToAdd).join(' '));
    },

    remove: function(classNameToRemove) {
        if (!this.include(classNameToRemove)) return;
        this.set(this.select(function(className) {
            return className != classNameToRemove;
        }).join(' '));
    },

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

Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
    clear: function() {
        for (var i = 0; i < arguments.length; i++)
            $(arguments[i]).value = '';
    },

    focus: function(element) {
        $(element).focus();
    },

    present: function() {
        for (var i = 0; i < arguments.length; i++)
            if ($(arguments[i]).value == '') return false;
        return true;
    },

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

    activate: function(element) {
        element = $(element);
        element.focus();
        if (element.select)
            element.select();
    }
}

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

var Form = {
    serialize: function(form) {
        var elements = Form.getElements($(form));
        var queryComponents = new Array();

        for (var i = 0; i < elements.length; i++) {
            var queryComponent = Form.Element.serialize(elements[i]);
            if (queryComponent)
                queryComponents.push(queryComponent);
        }

        return queryComponents.join('&');
    },

    getElements: function(form) {
        form = $(form);
        var elements = new Array();

        for (tagName in Form.Element.Serializers) {
            var tagElements = form.getElementsByTagName(tagName);
            for (var j = 0; j < tagElements.length; j++)
                elements.push(tagElements[j]);
        }
        return elements;
    },

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

        if (!typeName && !name)
            return inputs;

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

        return matchingInputs;
    },

    disable: function(form) {
        var elements = Form.getElements(form);
        for (var i = 0; i < elements.length; i++) {
            var element = elements[i];
            element.blur();
            element.disabled = 'true';
        }
    },

    enable: function(form) {
        var elements = Form.getElements(form);
        for (var i = 0; i < elements.length; i++) {
            var element = elements[i];
            element.disabled = '';
        }
    },

    findFirstElement: function(form) {
        return Form.getElements(form).find(function(element) {
            return element.type != 'hidden' && !element.disabled &&
        ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
        });
    },

    focusFirstElement: function(form) {
        Field.activate(Form.findFirstElement(form));
    },

    reset: function(form) {
        $(form).reset();
    }
}

Form.Element = {
    serialize: function(element) {
        element = $(element);
        var method = element.tagName.toLowerCase();
        var parameter = Form.Element.Serializers[method](element);

        if (parameter) {
            var key = encodeURIComponent(parameter[0]);
            if (key.length == 0) return;

            if (parameter[1].constructor != Array)
                parameter[1] = [parameter[1]];

            return parameter[1].map(function(value) {
                return key + '=' + encodeURIComponent(value);
            }).join('&');
        }
    },

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

        if (parameter)
            return parameter[1];
    }
}

Form.Element.Serializers = {
    input: function(element) {
        switch (element.type.toLowerCase()) {
            case 'submit':
            case 'hidden':
            case 'password':
            case 'text':
                return Form.Element.Serializers.textarea(element);
            case 'checkbox':
            case 'radio':
                return Form.Element.Serializers.inputSelector(element);
        }
        return false;
    },

    inputSelector: function(element) {
        if (element.checked)
            return [element.name, element.value];
    },

    textarea: function(element) {
        return [element.name, element.value];
    },

    select: function(element) {
        return Form.Element.Serializers[element.type == 'select-one' ?
      'selectOne' : 'selectMany'](element);
    },

    selectOne: function(element) {
        var value = '', opt, index = element.selectedIndex;
        if (index >= 0) {
            opt = element.options[index];
            value = opt.value;
            if (!value && !('value' in opt))
                value = opt.text;
        }
        return [element.name, value];
    },

    selectMany: function(element) {
        var value = new Array();
        for (var i = 0; i < element.length; i++) {
            var opt = element.options[i];
            if (opt.selected) {
                var optValue = opt.value;
                if (!optValue && !('value' in opt))
                    optValue = opt.text;
                value.push(optValue);
            }
        }
        return [element.name, value];
    }
}

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

var $F = Form.Element.getValue;

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

Abstract.TimedObserver = function() { }
Abstract.TimedObserver.prototype = {
    initialize: function(element, frequency, callback) {
        this.frequency = frequency;
        this.element = $(element);
        this.callback = callback;

        this.lastValue = this.getValue();
        this.registerCallback();
    },

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

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

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

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

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

Abstract.EventObserver = function() { }
Abstract.EventObserver.prototype = {
    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() {
        var elements = Form.getElements(this.element);
        for (var i = 0; i < elements.length; i++)
            this.registerCallback(elements[i]);
    },

    registerCallback: function(element) {
        if (element.type) {
            switch (element.type.toLowerCase()) {
                case 'checkbox':
                case 'radio':
                    Event.observe(element, 'click', this.onElementEvent.bind(this));
                    break;
                case 'password':
                case 'text':
                case 'textarea':
                case 'select-one':
                case 'select-multiple':
                    Event.observe(element, 'change', this.onElementEvent.bind(this));
                    break;
            }
        }
    }
}

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

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

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,

    element: function(event) {
        return event.target || event.srcElement;
    },

    isLeftClick: function(event) {
        return (((event.which) && (event.which == 1)) ||
            ((event.button) && (event.button == 1)));
    },

    pointerX: function(event) {
        return event.pageX || (event.clientX +
      (document.documentElement.scrollLeft || document.body.scrollLeft));
    },

    pointerY: function(event) {
        return event.pageY || (event.clientY +
      (document.documentElement.scrollTop || document.body.scrollTop));
    },

    stop: function(event) {
        if (event.preventDefault) {
            event.preventDefault();
            event.stopPropagation();
        } else {
            event.returnValue = false;
            event.cancelBubble = true;
        }
    },

    // find the first node with the given tagName, starting from the
    // node the event was triggered on; traverses the DOM upwards
    findElement: function(event, tagName) {
        var element = Event.element(event);
        while (element.parentNode && (!element.tagName ||
        (element.tagName.toUpperCase() != tagName.toUpperCase())))
            element = element.parentNode;
        return element;
    },

    observers: false,

    _observeAndCache: function(element, name, observer, useCapture) {
        if (!this.observers) this.observers = [];
        if (element.addEventListener) {
            this.observers.push([element, name, observer, useCapture]);
            element.addEventListener(name, observer, useCapture);
        } else if (element.attachEvent) {
            this.observers.push([element, name, observer, useCapture]);
            element.attachEvent('on' + name, observer);
        }
    },

    unloadCache: function() {
        if (!Event.observers) return;
        for (var i = 0; i < Event.observers.length; i++) {
            Event.stopObserving.apply(this, Event.observers[i]);
            Event.observers[i][0] = null;
        }
        Event.observers = false;
    },

    observe: function(element, name, observer, useCapture) {
        var element = $(element);
        useCapture = useCapture || false;

        if (name == 'keypress' &&
        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
        || element.attachEvent))
            name = 'keydown';

        this._observeAndCache(element, name, observer, useCapture);
    },

    stopObserving: function(element, name, observer, useCapture) {
        var element = $(element);
        useCapture = useCapture || false;

        if (name == 'keypress' &&
        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
        || element.detachEvent))
            name = 'keydown';

        if (element.removeEventListener) {
            element.removeEventListener(name, observer, useCapture);
        } else if (element.detachEvent) {
            element.detachEvent('on' + name, observer);
        }
    }
});

/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
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;
    },

    realOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.scrollTop || 0;
            valueL += element.scrollLeft || 0;
            element = element.parentNode;
        } while (element);
        return [valueL, valueT];
    },

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

    positionedOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
            valueT += element.offsetTop || 0;
            valueL += element.offsetLeft || 0;
            element = element.offsetParent;
            if (element) {
                p = Element.getStyle(element, 'position');
                if (p == 'relative' || p == 'absolute') break;
            }
        } while (element);
        return [valueL, valueT];
    },

    offsetParent: 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;
    },

    // 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 = this.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 = this.realOffset(element);

        this.xcomp = x + offsetcache[0] - this.deltaX;
        this.ycomp = y + offsetcache[1] - this.deltaY;
        this.offset = this.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;
    },

    clone: function(source, target) {
        source = $(source);
        target = $(target);
        target.style.position = 'absolute';
        var offsets = this.cumulativeOffset(source);
        target.style.top = offsets[1] + 'px';
        target.style.left = offsets[0] + 'px';
        target.style.width = source.offsetWidth + 'px';
        target.style.height = source.offsetHeight + 'px';
    },

    page: 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)
                if (Element.getStyle(element, 'position') == 'absolute') break;

        } while (element = element.offsetParent);

        element = forElement;
        do {
            valueT -= element.scrollTop || 0;
            valueL -= element.scrollLeft || 0;
        } while (element = element.parentNode);

        return [valueL, valueT];
    },

    clone: function(source, target) {
        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 = Position.page(source);

        // find coordinate system to use
        target = $(target);
        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(target, 'position') == 'absolute') {
            parent = Position.offsetParent(target);
            delta = Position.page(parent);
        }

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

    absolutize: function(element) {
        element = $(element);
        if (element.style.position == 'absolute') return;
        Position.prepare();

        var offsets = Position.positionedOffset(element);
        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'; ;
    },

    relativize: function(element) {
        element = $(element);
        if (element.style.position == 'relative') return;
        Position.prepare();

        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;
    }
}

// Safari returns margins on body which is incorrect if the child is absolutely
// positioned.  For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
    Position.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 [valueL, valueT];
    }
}