var NS = (navigator.appName.indexOf("Netscape") != -1);
var IE = (navigator.appName.indexOf("Microsoft") != -1);

function popup(myurl,h,w)
{
	if(! h){h = 280;}
	if(! w){w = 400;}

	var param = "height=" + h + ",width=" + w + ",";

	if(NS)
	{
	   param += "screenX=20,screenY=20,location=no,toolbar=no,resizable=no,scrollbars=yes,status=no";
	}
	else
	{
	   param += "left=20,top=20,location=no,toolbar=no,resizable=no,scrollbars=yes,status=no";
	}
	
	nw = window.open(myurl,'',param);

}