function addBookmark( title, url )
  {
    if (title == undefined)
      title = document.title;

    if (url == undefined)
      url = top.location.href;
      
    if (window.sidebar) // firefox
      window.sidebar.addPanel(title, url, '');
    else if(window.opera && window.print) // opera
    {
      var elem = document.createElement('a');
      elem.setAttribute('href',url);
      elem.setAttribute('title',title);
      elem.setAttribute('rel','sidebar');
      elem.click();
    } 
    else if(document.all) // ie
      window.external.AddFavorite(url, title);
    else if (navigator.appName=="Netscape") //Netscape
      alert( 'To bookmark this site press "Ctrl+D".' );
    else
      alert( 'Dein Browser unterstuezt diese Funktion nicht!' );
  }