asp 文字循环滚动（up）

<div id="storyScroller" style="width:100%;height:140px;line-height:28px;overflow:hidden;">
 <div id="storyScrollMid">
  <ul id="storyScrollUl" style=" list-style-type:circle; list-style-position: outside; margin-left:18px; margin-right:0px">
<li>item01</li>
<li>item02</li>
<li>item03</li>
<li>item04</li>
<li>item05</li>
<li>item06</li>
<li>item07</li>
<li>item08</li>
    </ul>
 </div>
</div>
<script type="text/javascript">
var scrollstory = document.getElementById('storyScroller');
var storycontainer = document.getElementById('storyScrollMid');
var storyliHeight;
var storylis = storycontainer.getElementsByTagName('li');
var isstory_stop = 0;
scrollstory.onmouseover = function() { isstory_stop = 1; }
scrollstory.onmouseout = function() { isstory_stop = 0; }
function story_scroller(){
 var story_step = 1;
 var timer1 = setInterval(function(){
 if(isstory_stop) return false;
 storyliHeight = storylis[0].offsetHeight;
 var timer2 = setInterval(function(){
 scrollstory.scrollTop += story_step;
 if(scrollstory.scrollTop >= storyliHeight){
  clearInterval(timer2);
  storylis[0].parentNode.appendChild(storylis[0]);
  scrollstory.scrollTop = 0;
            }
          },10);
          },5000);
       }
story_scroller();
</script>