function popup(url, name, height, width, scrollbars){
  var popwin;
  var opts = "toolbar=no,status=yes,location=no,menubar=no,resizable=yes";
  opts += ",height=" + height + ",width=" + width + ",scrollbars=" + scrollbars;
 
  popwin = window.open("", name, opts);
  popwin.focus();
  popwin.location = url;

  return false;
}