function popup() {
	var w = 600;
	var h = 150;
	leftVal = (screen.width-w)/2;
	topVal = (screen.height-h)/2;
	var pop = window.open("load.php","_blank","menubar=no,status=no,toolbar=no,resizable=no,height=150,width=600,left="+leftVal+",top="+topVal);

}