function addfav() {
    addBookmark(document.title, document.URL, '');
}
function addBookmark(title, url, desc) {
    if (window.sidebar) {
        try {
            window.sidebar.addPanel(title, url, desc); //Mozilla browser
        } catch (e) { window.external.AddFavorite(url, title); }
    } else if (document.all) { //IE browser   
        window.external.AddFavorite(url, title);
    } else if (window.opera && window.print) { //not support Now   
        return true;
    }
}