测上网速度，动态树

<SCRIPT language=JavaScript>
    <!--
    window.onload = function()
    {
      var s = new Date().getTime()-t1;
      var msg = "加载本网页一共花出 "+ s +" 毫秒！";
      msg += "\r\n你的网速是： "+ (198/s*1000+"").match(/^\d+(\.\d{1,3})?/)[0] +" K/秒";
      getObjectById("Wload").innerText = msg;
      alert(msg);
    }

</SCRIPT>