function popup(w, h, target, name){
	var w = w;
	var h = h;
	var name = name;
	var winl = (screen.width - w) / 2;
	var wint = (screen.height - h) / 2 - 30;
	winprops = 'height='+h+',width='+w+',top='+wint+',left='+winl+',status=no,location=no,scrollbars=yes,resizable=yes';
	name = window.open(target, name, winprops);
}