function openPopup(url, name, w, h, perc) 
{        
	var winX = (screen.availWidth - w)*perc*.01;        
	var winY = (screen.availHeight - h)*perc*.01;        
	popupWin = window.open(url, name, 'scrollbars=no, resizable=yes, status=no, toolbar=no, location=no, menubar=no, directories=no, width=' + w + ', height=' + h + ', left=' + winX + ', top=' + winY);
	popupWin.focus();
}