<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>