function addfav(){  
    try{  
        window.external.AddFavorite('http://www.nws.gov.cn','农五师门户网');   
    }catch(e){  
        (window.sidebar)?window.sidebar.addPanel('农五师门户网','http://www.nws.gov.cn',''):alert('请使用按键 Ctrl+d，收藏农五师门户网');   
    }  
}  
  
function setHomepage(){　 // 设置首页  
    if (document.all){  
        document.body.style.behavior = 'url(#default#homepage)';  
        document.body.setHomePage('http://www.nws.gov.cn');  
    }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.nws.gov.cn');  
    }  
}