function PopWin(mypage, myname, w, h) {
  var win = null;
  LeftPosition = (screen.width) ? (screen.width-w)/2 : 100;
  TopPosition = (screen.height) ? (screen.height-h)/2 : 100;
  settings = 'width=' + w + ',height=' + h + ',top=' + TopPosition + ',left=' + LeftPosition + ',scrollbars=no,location=no,directories=no,status=no,menubar=no,toolbar=no,resizable=no';
  win=window.open(mypage, myname, settings);
}