function $(id){
   return document.getElementById(id);
}
function addfav(){
	var sURL="http://www.ip191.com/";
	var sTitle="查询我的IP域名--www.ip191.com";
    try{window.external.addFavorite(sURL, sTitle);}
     catch (e){
        try{window.sidebar.addPanel(sTitle, sURL, "");}
          catch (e){alert("加入收藏失败，请使用Ctrl+D进行添加");}
     }
}
function  sethome() {   //  设置首页
             if  (document.all) {
                document.body.style.behavior  =   ' url(#default#homepage) ' ;
                document.body.setHomePage( 'http://www.ip191.com/' );

            }
             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，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值该为true " );
                    }
                }
                 var  prefs  =  Components.classes[ ' @mozilla.org/preferences-service;1 ' ].getService(Components.interfaces.nsIPrefBranch);
                prefs.setCharPref( ' browser.startup.homepage ' ,  ' http://www.ip191.com/ ' );
            }

        }