function popUp(ref,popup_height,popup_width){
  var strFeatures="toolbar=no,status=no,menubar=no,location=no"
  
  var popup_height = (popup_height == undefined) ? 350 : popup_height;
  var popup_width = (popup_width == undefined) ? 470 : popup_width;
  
  strFeatures=strFeatures+",scrollbars=yes,resizable=yes,height=" + popup_height + ",width=" + popup_width + ",left=250,top=150,screenX=250,screenY=150"

  newWin = window.open(ref,"TellObj",strFeatures);
  newWin.opener = top;
  newWin.focus();
}