function popup(loc)
{
	var left = (screen.width - 300)/2;
	var top = (screen.height - 400)/2.1;
	window.open(loc, "_blank", "left = " + left + ", top = " + top + ", toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=yes, copyhistory=no, width=300, height=400");
	return false;
}