function OpenBooknarkDialog(site_url, site_name) {
    if(navigator.userAgent.indexOf("MSIE") >

 -1){
        window.external.AddFavorite(site_url, site_name);
        return true;
    } else if(navigator.userAgent.indexOf("Firefox") >

 -1){
        window.sidebar.addPanel(site_name, site_url, "");
        return true;
    } else {
        return false;
    }
}