var setHomePage = function(url) {
    url = url || "http://" + document.location.host;
    if (!window.confirm("是否设置" + url + "为首页?")) return false;
    if (document.all) {
        document.body.style.behavior = 'url(#default#homepage)';
        document.body.setHomePage(url);
    } else if (window.sidebar) {
        if (window.netscape) {
            try {
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
            } catch(e) {
                alert("this action was aviod by your browser，if you want to enable，please enter about:config in your address line,and change the value of signed.applets.codebase_principal_support to true");
            }
        }
        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
        prefs.setCharPref('browser.startup.homepage', url);
    }
}

var addFavorite = function(url, title) {
    if (arguments.length == 0) {
        url = window.location.href;
        title = document.title;
    } else if (arguments.length == 1) {
        url = window.location.href;
    } else {;
    }
    if (confirm("网站名称：" + title + "\n网址：" + url + "\n确定添加收藏?")) {
        var ua = navigator.userAgent.toLowerCase();
        if (ua.indexOf("msie 8") > -1) {
            external.AddToFavoritesBar(url, title, ''); //IE8
        } else {
            try {
                window.external.addFavorite(url, title);
            } catch(e) {
                try {
                    window.sidebar.addPanel(title, url, ""); //firefox
                } catch(e) {
                    alert("加入收藏失败，请使用Ctrl+D进行添加");
                }
            }
        }
    }
}