function openChild(url, width, height) 
{
	leftC = (screen.width - width) / 2;
	topC = (screen.height - height) / 2;
	window.open(url, null, "width=" + width + ", height=" + height + ",top=" + topC + ",left=" + leftC + ",location=no, menubar=no, status=no, toolbar=no, scrollbars=1,resizable=no");
}