JavaScript “设为主页”与“收藏本页”

/**
 * 设为主页
 * @param obj 参数为this
 */
function SetHome(obj) {   
        try {   
            var url = window.location.href; //获取当前url地址
            obj.style.behavior = 'url(#default#homepage)';   
            obj.setHomePage(url);   
        } catch (e) {   
            if (window.netscape) {   
                try {   
                    netscape.security.PrivilegeManager   
                            .enablePrivilege("UniversalXPConnect");   
                } catch (e) {   
                    alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将 [signed.applets.codebase_principal_support]的值设置为'true',双击即可。");   
                }   
                var prefs = Components.classes['@mozilla.org/preferences-service;1']   
                        .getService(Components.interfaces.nsIPrefBranch);   
                prefs.setCharPref('browser.startup.homepage', vrl);   
            }   
        }   
}
/**
 * 收藏本页
 */
function addFavorite(){
    var url = window.location.href; //获取当前url地址
    var title = document.title; //获取当前网站标题
    try {
        window.external.addFavorite(url, title);
    } catch (e) {
        try {
            window.sidebar.addPanel(title, url, "");
        } catch (e) {
            alert("加入收藏失败,请手动添加.");
        }
    }
}