function pop(u, w, h) {
	w += 20;
	h += 20;
	l = (screen.width - w) / 2;
	t = (screen.height - h) / 2;
	property = "scrollbars = no, width = " + w + ", height = " + h + ", top = " + t + ", left = " + l;
	window.open(u, "_blank", property);
}