Js添加收藏夹代码 完美支持火狐FF等浏览器

<script type="text/javascript">
//添加收藏
function addfavorite(url,title){
var fav_url = url;
var fav_title = title;
if (document.all && window.external){
window.external.AddFavorite(fav_url,fav_title);
}else if (window.sidebar){
window.sidebar.addPanel(fav_title,fav_url,"");
}else{
alert("浏览器不支持，请手动CTRL+D加入收藏夹");
}
}
</script>