function addbookmark(){
  
  var bookmarkURL = self.location;
  var bookmarkText = document.title;
  
  if (window.sidebar)
    {
    // firefox
    window.sidebar.addPanel(bookmarkText,bookmarkURL, "");
    }
  else if(window.opera && window.print)
    {
    // opera
    var elem = document.createElement('a');
    elem.setAttribute('href',bookmarkURL);
    elem.setAttribute('title',bookmarkText);
    elem.setAttribute('rel','sidebar');
    elem.click();
    }
  else if(document.all)
    {
    // ie
    window.external.AddFavorite(bookmarkURL,bookmarkText);
    }
}