function add_fav(url,title) {
if(navigator.appName=="Microsoft Internet Explorer") {
window.external.addFavorite(url,title)
}else if (window.sidebar){
window.sidebar.addPanel(title,url, "");
}
}
function setHomepage(url){
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("亲爱的用户你好：\n你使用的不是IE浏览器，此操作被浏览器阻挡了，你可以选择手动设置为首页功能，开启方法：先在地址栏内输入about:config,然后将项 signed.applets.codebase_principal_support 值该为true即可");
             }
        }
        var prefs=Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
        prefs.setCharPref('browser.startup.homepage',url);
   }
}