function popup(w, h, URL) {
 	var l = ((screen.width - w) / 2);
 	var t = ((screen.height - h) / 2);

 	var windowprops = "location=no,scrollbars=no,menubars=no,toolbar=no,resizable=no" +",left=" + l + ",top=" + t + ",width=" + w + ",height=" + h;
 	window.open(URL,"",windowprops);
}