加入收藏BUG改善

<script type="text/javascript">
function add_favorite(a, title, url) {
url = url || a.href;
title = title || a.title;
try{ // IE
window.external.addFavorite(url, title);
} catch(e) {
try{ // Firefox
window.sidebar.addPanel(title, url, "");
} catch(e) {
if (/Opera/.test(window.navigator.userAgent)) { // Opera
a.rel = "sidebar";
a.href = url;
return true;
}
alert('加入收藏失败，请使用 Ctrl+D 进行添加');
}
}
return false;
}
function set_homepage(a, url) {
var tip = '您的浏览器不支持此操作\n请使用浏览器的“选项”或“设置”等功能设置首页';
if (/360se/i.test(window.navigator.userAgent)) {
alert(tip);
return false;
}
url = url || a.href;
try {
a.style.behavior = 'url(#default#homepage)';
a.setHomePage(url);
} catch(e) {
alert(tip);
}
return false;
}
</script>