// original version written by Dean Edwards:  http://dean.edwards.name/weblog/2005/10/add-event/
// with input from Tino Zijdel - crisp@xs4all.nl
// branching version 2007-04-27 by Tino Zijdel
var addEvent = function()
{
	if (document.addEventListener)
	{
		return function(element, type, handler)
		{
			element.addEventListener(type, handler, false);
		}
	}
	else
	{
		function handleEvent(event)
		{
			event = event || fixEvent(window.event);

			var handlers = this.events[event.type], returnValue;
			for (var i in handlers)
			{
				if (handlers.hasOwnProperty(i) && handlers[i].call(this, event) === false)
					returnValue = false;
			}
		
			return returnValue;
		}
		function fixEvent(event)
		{
			event.preventDefault = preventDefault;
			event.stopPropagation = stopPropagation;

			return event;
		}
		function preventDefault() { this.returnValue = false; }
		function stopPropagation() { this.cancelBubble = true; }

		var guid = 1;

		return function(element, type, handler)
		{
			if (!handler.$$guid) handler.$$guid = guid++;
			if (!element.events) element.events = {};
			if (!element.events[type])
			{
				element.events[type] = {};
				if (element['on' + type]) element.events[type][0] = element['on' + type];
				element['on' + type] = handleEvent;
			}

			element.events[type][handler.$$guid] = handler;
		}
	}
}();

var removeEvent = function()
{
	if (document.removeEventListener)
	{
		return function(element, type, handler)
		{
			element.removeEventListener(type, handler, false);
		}
	}
	else
	{
		return function(element, type, handler)
		{
			if (element.events && element.events[type] && handler.$$guid)
				delete element.events[type][handler.$$guid];
		}
	}
}();