function FensterAuf(theURL,winName,wWidth,wHeight)
{
      var fenster = window.open(theURL,winName,'status=no,scrollbars=yes,menubar=yes,resizable=yes,width='+wWidth+',height='+wHeight+'');
      if (fenster.opener == null)
      {
        fenster.opener = self;
      }
}