var isDown = false;
      var upH = 16; // 上箭头的高度
      var upW = 16; //上箭头的宽度
      var downH = 16; //下箭头的高度
      var downW = 16; //下箭头的宽度
      var dragH = 36; // 滚动条的高度
      var dragW = 16; //滚动条的宽度
      var scrollH = 92; //滚动条可移动的高度
      var contentHeight = 0;
      var dragPos = 0;  //滚动条的位置
      var downPos;      //点击位置
      var eventY;
      var clickRate = 0.5; //箭头移动速度
      var direct = 0;
      var timer = 20;

      function move()
      {
        //td1.innerText = event.clientX + "," + event.clientY;
        if (isDown)
        {
          contentHeight = scrollerContent.offsetHeight - 124;
          eventY = event.clientY < 0 ? 0 : event.clientY > 144 ? 144 : event.clientY;
          dragPos += eventY - downPos;
          downPos = eventY;
          dragPos = dragPos < 0 ? 0 : dragPos > scrollH ? scrollH : dragPos;
          drag.style.top = dragPos + upH;
          scrollerContent.style.top = contentHeight / 92 * (-dragPos);
        }
        event.returnValue = false;
      }

      function up()
      {
        isDown = false;
      }

      function down()
      {

        isDown = true;
        downPos = event.clientY;
      }

      function clickmove()
      {
        contentHeight = scrollerContent.offsetHeight - 124;
        dragPos -= clickRate * direct;
        dragPos = dragPos < 0 ? 0 : dragPos > scrollH ? scrollH : dragPos;
        drag.style.top = dragPos + upH;
        scrollerContent.style.top = contentHeight / 92 * (-dragPos);
        if (direct != 0)
        {
          window.setTimeout(clickmove, timer);
        }
      }