function PopUp(theURL,winName,height,width,features)
{
  var w = width, h = height;
  var wl = Math.round ((screen.width / 2) - (w / 2));
  var wt = Math.round ((screen.height / 2) - (h / 2));

  window.open(theURL,winName,'width=' + w + ',height=' + h + ',top=' + wt + ',left=' + wl + ',' + features);
}