function addbookmark(bookmarkurl,bookmarktitle){
if (document.all)
window.external.AddFavorite(bookmarkurl,bookmarktitle);

else if (window.sidebar)
        alert('This feature only works for Internet Explorer, use Control+D to bookmark This website');
       
else if( window.opera && window.print )
        alert('This feature only works for Internet Explorer, use Control+T to bookmark This website');
}