function check_search() { 
var keywords = document.getElementById('keywords').value;
		if ((keywords==null)||(keywords.length==0)) { 
				alert("请输入关键词！"); 
				return false; 
				} 
}
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,"");
    }
}