function bookmark(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);
        }
        else {
            alert("Sorry! Your browser doesn't support this function. Please bookmark this page manually.");
        }
    }