function popupWindow(url,x1,y1,x2,y2) {
  window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=yes,copyhistory=no,width='+x1+',height='+y1+',screenX=150,screenY=150,top='+y2+',left='+x2)
}