function popup(url,w,h) {
  var size = ",width="+w+",height="+h;
  childwin = window.open(url, "jpcPopup", "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1"+size);
  if (childwin.focus) { childwin.focus()}
  return false;
}