function addfavorite()
{
   if (document.all)
   {
      window.external.addFavorite('http://www.unitpak.com.hk','UNITPAK');
   }
   else if (window.sidebar)
   {
      window.sidebar.addPanel('UNITPAK', 'http://www.unitpak.com.hk', "");
   }
}