function addEvent(elm, evType, fn, useCapture)
{
	if (elm.addEventListener)
	{
		elm.addEventListener(evType, fn, useCapture);
		return true;
	}
	else if (elm.attachEvent)
	{
		var r = elm.attachEvent('on' + evType, fn);
		return r;
	}
	else
	{
		elm['on' + evType] = fn;
	}
}

function detachEvent(target, eventType, functionRef, capture)
{
	if ( typeof target.removeEventListener != "undefined" )
	{
		target.removeEventListener( eventType, functionRef, capture );
	}
	else if ( typeof target.detachEvent != "undefined" )
	{
		target.detachEvent( "on" + eventType, functionRef );
	}
	else
	{
		target["on" + eventType] = null;
	}
}