var host = window.location.host; //获取主机域名
                        
                        function addfavorite() {//添加到收藏夹   
                            if (document.all) {
                                window.external.addFavorite(document.URL, document.title);
                            } else if (window.sidebar) {
                                window.sidebar.addPanel(document.title, document.URL, "");
                            }   
                        }

                        function sethomepage() {//设为首页

                            if (document.all) {
                                document.body.style.behavior = 'url(#default#homepage)';
                                document.body.setHomePage(document.URL);
                            } else if (window.sidebar) {
                                if (window.netscape) {
                                    try {
                                        netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
                                    } catch (e) {
                                        alert("该操作被浏览器拒绝!");
                                    }
                                }
                                var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
                                prefs.setCharPref('browser.startup.homepage', document.URL);
                            }   

                        
                        }