var T = 400;
    var N = 400; //高度
    function noneAds()
    {
        if(T>0)
        {
            T--;
            N = N-100;
        }
        else
        {
            return;
        }
        if(N<0)
        {
            document.getElementById("ads").style.display = "none";
            return;
        }
        
        document.getElementById("ads").style.height = N+"px";
        setTimeout("noneAds()",30); 
    }