function bookmark(aTitle, aURL)
{
   if (!aTitle) {
       aTitle = document.title;
   }

   if (!aURL) {
       aURL = location.href;
   }

   if (window.sidebar) {
       // Gecko family
       window.sidebar.addPanel(aTitle, aURL, '');
   } else if (window.external) {
       // Trident & Tasman family
       window.external.AddFavorite(aURL, aTitle);
   } else if (window.opera) {
       if (window.print) {
           // Presto family
           return true;
       } else {
           // Elektra family
           var link = document.createElement('a');
               link.setAttribute('rel', 'sidebar');
               link.setAttribute('href', aURL);
               link.setAttribute('title', aTitle);
               link.click();
               document.removeElement(link);
       }
   } else {
       // Other engines
       alert('Configure sua mensagem aqui :)');
   }
}