function sethomepage(obj){    
    var aurls=document.url.split("/");
    var vdomainname="http://"+aurls[2]+"/";
    try{//ie
        obj.style.behavior="url(#default#homepage)";
        obj.sethomepage(vdomainname);
    }catch(e){//other
        if(window.netscape) {//ff
            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]设置为'true'"); 
            }
            var prefs = components.classes['@mozilla.org/preferences-service;1'].getservice(components.interfaces.nsiprefbranch);
            prefs.setcharpref('browser.startup.homepage',vdomainname);
         }
    }
    if(window.netscape)alert("ff");
}

function addfavorite(){
    var aurls=document.url.split("/");
    var vdomainname="http://"+aurls[2]+"/";
    var description=document.title;
    try{//ie
        window.external.addfavorite(vdomainname,description);
    }catch(e){//ff
        window.sidebar.addpanel(description,vdomainname,"");
    }
}