var T = 260;
     var N = 266; //高度
     function noneAds()
     {
         if(T>0)
         {
             T--;
             N = N-5;
         }
         else
         {
             return;
         }
         if(N<0)
         {
             document.getElementById("xiaoyixue").style.display = "none";
             return;
         }
        
         document.getElementById("xiaoyixue").style.height = N+"px";
         setTimeout("noneAds()",30); 
     }