var searchWindow=null;
    function lvzpopup(datei,name,breite,hoehe)
    {
      var searchWindow;
      if(searchWindow){ searchWindow.close();searchWindow=null; }
        searchWindow=window.open(datei,name,"width="+breite+",height="+hoehe+",wtoolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes");
      if(searchWindow){ searchWindow.focus(); } 
    }