Add to BOOK MARK using Javascript

Below JavaScript can be used to set Book Mark link

JAVASCRIPT:
<script type="text/javascript">
function bookmarksite(title,url){
if (window.sidebar) // firefox
    window.sidebar.addPanel(title, url, "");
else if(window.opera && window.print){ // opera
    var elem = document.createElement('a');
    elem.setAttribute('href',url);
    elem.setAttribute('title',title);
    elem.setAttribute('rel','sidebar');
    elem.click();
}
else if(document.all)// ie
    window.external.AddFavorite(url, title);
}
</script>

HTML CODE:
<a href="javascript:bookmarksite('Google', 'http://www.google.com')"> Add to Favorites </a>