function OpenPopupCenter(pageURL, title, w, h) ( var left = (screen.width - w) / 2; var top = (screen.height - h) / 4; // for 25% - devide by 4 | for 33% - devide by 3 var targetWin = window.open(pageURL, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, copyhistory=no, width=' w ', height=' h ', top=' top ', left=' left); )