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>