/*  Prototype JavaScript framework, version 1.4.0_pre2
*  (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_pre2',
emptyFunction: function() {}
}

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.prototype.extend = function(object) {
return Object.extend.apply(this, [this, object]);
}
*/

Function.prototype.bind = function(object) {
	var __method = this;
	return function() {
		return __method.apply(object, arguments);
	}
}

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

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

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;
}

if (!Array.prototype.push) {
	Array.prototype.push = function() {
		var startLength = this.length;
		for (var i = 0; i < arguments.length; i++)
		this[startLength + i] = arguments[i];
		return this.length;
	}
}

if (!Function.prototype.apply) {
	// Based on code from http://www.youngpup.net/
	Function.prototype.apply = function(object, parameters) {
		var parameterStrings = new Array();
		if (!object)     object = window;
		if (!parameters) parameters = new Array();
		
		for (var i = 0; i < parameters.length; i++)
		parameterStrings[i] = 'parameters[' + i + ']';
		
		object.__apply__ = this;
		var result = eval('object.__apply__(' + 
		parameterStrings.join(', ') + ')');
		object.__apply__ = null;
		
		return result;
	}
}

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

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].nodeValue;
	}
});

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

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 {
			if (this.options.method == 'get')
			url += '?' + parameters;

			this.transport.open(this.options.method, 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) {
		}
	},

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);
	},

respondToReadyState: function(readyState) {
		var event = Ajax.Request.Events[readyState];

		if (event == 'Complete')
		(this.options['on' + this.transport.status]
		|| this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
		|| Prototype.emptyFunction)(this.transport);

		(this.options['on' + event] || Prototype.emptyFunction)(this.transport);

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

Ajax.Updater = Class.create();
Ajax.Updater.ScriptFragment = '(?:<script.*?>)((\n|.)*?)(?:<\/script>)';

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() {
			this.updateContent();
			onComplete(this.transport);
		}).bind(this);

		this.request(url);
	},

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

		var match    = new RegExp(Ajax.Updater.ScriptFragment, 'img');
		var response = this.transport.responseText.replace(match, '');
		var scripts  = this.transport.responseText.match(match);

		if (receiver) {
			if (this.options.insertion) {
				new this.options.insertion(receiver, response);
			} else {
				receiver.innerHTML = response;
			}
		}

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

		if (this.options.evalScripts && scripts) {
			match = new RegExp(Ajax.Updater.ScriptFragment, 'im');
			setTimeout((function() {
				for (var i = 0; i < scripts.length; i++)
				eval(scripts[i].match(match)[1]);
			}).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 = 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 || Ajax.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) {
	var children = document.getElementsByTagName('*') || document.all;
	var elements = new Array();

	for (var i = 0; i < children.length; i++) {
		var child = children[i];
		var classNames = child.className.split(' ');
		for (var j = 0; j < classNames.length; j++) {
			if (classNames[j] == className) {
				elements.push(child);
				break;
			}
		}
	}

	return elements;
}

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

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

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

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);
	},

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

hasClassName: function(element, className) {
		element = $(element);
		if (!element)
		return;
		var a = element.className.split(' ');
		for (var i = 0; i < a.length; i++) {
			if (a[i] == className)
			return true;
		}
		return false;
	},

addClassName: function(element, className) {
		element = $(element);
		Element.removeClassName(element, className);
		element.className += ' ' + className;
	},

removeClassName: function(element, className) {
		element = $(element);
		if (!element)
		return;
		var newClassName = '';
		var a = element.className.split(' ');
		for (var i = 0; i < a.length; i++) {
			if (a[i] != className) {
				if (i > 0)
				newClassName += ' ';
				newClassName += a[i];
			}
		}
		element.className = newClassName;
	},

	// removes whitespace-only text node children
cleanWhitespace: function(element) {
		var 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);
		}
	}
});

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;
		
		if (this.adjacency && this.element.insertAdjacentHTML) {
			this.element.insertAdjacentHTML(this.adjacency, this.content);
		} else {
			this.range = this.element.ownerDocument.createRange();
			if (this.initializeRange) this.initializeRange();
			this.fragment = this.range.createContextualFragment(this.content);
			this.insertContent();
		}
	}
}

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() {
		this.element.parentNode.insertBefore(this.fragment, this.element);
	}
});

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() {  
		this.element.insertBefore(this.fragment, this.element.firstChild);
	}
});

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() {
		this.element.appendChild(this.fragment);
	}
});

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

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

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).focus();
		$(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) {
		var 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) {
		var 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 = '';
		}
	},

focusFirstElement: function(form) {
		var form = $(form);
		var elements = Form.getElements(form);
		for (var i = 0; i < elements.length; i++) {
			var element = elements[i];
			if (element.type != 'hidden' && !element.disabled) {
				Field.activate(element);
				break;
			}
		}
	},

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

Form.Element = {
serialize: function(element) {
		var element = $(element);
		var method = element.tagName.toLowerCase();
		var parameter = Form.Element.Serializers[method](element);
		
		if (parameter)
		return encodeURIComponent(parameter[0]) + '=' + 
		encodeURIComponent(parameter[1]);                   
	},

getValue: function(element) {
		var 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) {
		var value = '';
		if (element.type == 'select-one') {
			var index = element.selectedIndex;
			if (index >= 0)
			value = element.options[index].value || element.options[index].text;
		} else {
			value = new Array();
			for (var i = 0; i < element.length; i++) {
				var opt = element.options[i];
				if (opt.selected)
				value.push(opt.value || opt.text);
			}
		}
		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':
				element.target = this;
				element.prev_onclick = element.onclick || Prototype.emptyFunction;
				element.onclick = function() {
					this.prev_onclick(); 
					this.target.onElementEvent();
				}
				break;
			case 'password':
			case 'text':
			case 'textarea':
			case 'select-one':
			case 'select-multiple':
				element.target = this;
				element.prev_onchange = element.onchange || Prototype.emptyFunction;
				element.onchange = function() {
					this.prev_onchange(); 
					this.target.onElementEvent();
				}
				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;
		}
	},

	// 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.indexOf('AppleWebKit') > 0) 
					|| 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.indexOf('AppleWebKit') > 0) 
					|| 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];
	},

	// 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';
	}
}