function openPopup(w,h,URL){
	l = screen.width/2-(w/2);
	t = screen.height/2-(h/2);
	
	if (typeof(nwin) != "object"){
		nwin=window.open(URL,'verify','height='+h+',width='+w+',top='+t+',left='+l+',dependent=yes,resizable=no,alwaysRaised=yes,modal=yes,status=yes,scrollbars=yes');
	} else {
		nwin.close();
		nwin=window.open(URL,'verify','height='+h+',width='+w+',top='+t+',left='+l+',dependent=yes,resizable=no,alwaysRaised=yes,modal=yes,status=yes,scrollbars=yes');
	}
	nwin.focus();
}