function CenterPopUp(p,t, w,h){
	var win= null;
	var left= (screen.width-w)/2;
	var top = (screen.height-h)/2;
	var par = "height=" + h + ",width=" + w + ",top=" + top + ",left=" + left + ",scrollbars=yes,toolbar=no";
	win=window.open(p,t,par);
	win.focus();
	}