<script type="text/javascript">
function bookmarksite(title, url){
if (document.all)
window.external.AddFavorite(url, title);
else if (window.sidebar)
window.sidebar.addPanel(title, url, "")
}
</script>

<a href="javascript:bookmarksite('Başlık', 'http://www.google.com')">Favorilere Ekleyin.</a>