window.onunload=ShowAd
function ShowAd()
{
return true;
//	if (closing) 
//	{
//		winfeatures = "dependent= yes,height=250,width=240,scrollbars=0,resizable=no,left=0,top=0";
//		winInv = window.open("LostFocusAd.htm","Advertise",winfeatures);
//	}
}