function bookmark_us(url, title){
  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);
}