js文字上下滚动代码

<div id="dome"> 
<div id="dome1"> 
<ul class="express"> 
{dede:arclist row='10' titlelen='36' orderby='pubdate' typeid='2' idlist=''}
<li>·<a href="[field:arcurl/]"><font color="#666666">[field:textlink/]([field:pubdate function=MyDate('m-d',@me)/])</font></a></li>
{/dede:arclist}
</ul>
</div> 
<div id="dome2"></div> 
</div> 

上面是HTML代码，下面是js代码

<script type="text/javascript"> 
var dome=document.getElementById("dome"); 
var dome1=document.getElementById("dome1"); 
var dome2=document.getElementById("dome2"); 
var speed=50;//设置向上轮动的速度 
dome2.innerHTML=dome1.innerHTML;//复制节点 

function moveTop(){ 
if(dome1.offsetHeight-dome.scrollTop<=0){ 
dome.scrollTop=0; 
}else
{ 
dome.scrollTop++; 
} 
} 
var myFunction=setInterval("moveTop()",speed); 
dome.onmouseover=function(){ 
clearInterval(myFunction); 
} 
dome.onmouseout=function(){ 
myFunction=setInterval(moveTop,speed); 
} 
              </script>