function addBookmark() {
window.external.AddFavorite(location.href, document.title);
}
function homePage(obj,val){
  try{
                obj.style.behavior='url(#default#homepage)';
                obj.setHomePage(val);
        }
        catch(e){
                if(window.netscape) {
                        try {
                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");  
                        }  
                        catch (e)  { 
                                alert("此操作被浏览器拒绝！");  
                        }
                        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
                        prefs.setCharPref('browser.startup.homepage',val);
                 }
        }
 }