function addEvent(obj, type, fn) 
{
	if (obj.addEventListener)
	{
		obj.addEventListener(type, fn, false);
	}
	else if (obj.attachEvent) 
	{
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() {obj["e"+type+fn](window.event);}
		obj.attachEvent("on"+type, obj[type+fn]);
	}
}
function removeEvent(obj, type, fn)
{
	if (obj.removeEventListener)
	{
		obj.removeEventListener(type, fn, false);
	}
	else if (obj.detachEvent) 
	{
		obj["e"+type+fn] = null;
		obj[type+fn] = null;
		obj.detachEvent("on"+type, obj[type+fn]);
	}
}