/*  Prototype JavaScript framework, version 1.4.0
 *  (c) 2005 Sam Stephenson <sam@conio.net>
 *
 *  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];
	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]);
	if (element != null)
		  element.style.display = 'none';
	}
},

show: function() {
	for (var i = 0; i < arguments.length; i++) {
	var element = $(arguments[i]);
	if (element != null)
		  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];
}
}