if(window.addEventListener)
{
	FixPrototypeForGecko();
}

function FixPrototypeForGecko()
{
	HTMLElement.prototype.__defineGetter__("runtimeStyle",element_prototype_get_runtimeStyle);
	window.constructor.prototype.__defineGetter__("event",window_prototype_get_event);
	Event.prototype.__defineGetter__("srcElement",event_prototype_get_srcElement);
}

function element_prototype_get_runtimeStyle()
{
	return this.style;
}

function window_prototype_get_event()
{
	return SearchEvent();
}
function event_prototype_get_srcElement()
{
	return this.target;
}

function SearchEvent()
{
	//ie
	if (document.all)
		return window.event;
	// firefox
	func = SearchEvent.caller;
	while (func != null)
	{
		var arg0 = func.arguments[0];
		if(arg0)
		{
			if(arg0.constructor == Event)
				return arg0;
		}
		func=func.caller;
	}
	return null;
}


// 创建xmlhttp对象
function CreateXmlhttp()
{
	if (window.ActiveXObject)	// IE
	{
		try
		{
			return new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e)
		{
			try
			{
				return new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
			{
				return null;
			}
		}
	}
	else if (window.xmlhttpRequest)	// Mozilla, Safari,...
	{
		try
		{
			return new XMLHttpRequest();
		}
		catch (e)
		{
			return null;
		}
	}
}