function pop(pg,ti,w,h,sb){
	var top=(screen.height-h)/2;
	var left=(screen.width-w)/2;
	var w=window.open(pg,ti,'resizable=no,location=no,top='+top+',left='+left+',width='+w+',height='+h+',status=yes,scrollbars='+sb+',menubar=no');
	w.focus();
	return false;
}