<div id=demo style=overflow:auto;height:180;width:200;background:#009900;color:#006600> 
<table  align=top> 
<tr> 
<td id=demo1 valign=top> 

<p>aaaaaaaaaaa</p> 
<p>aaaaaaaaaaa</p> 
<p>aaaaaaaaaaa</p> 
<p>aaaaaaaaaaa</p> 
<p>aaaaaaaaaaa</p> 
<p>aaaaaaaaaaa</p> 


 </td> 
</tr> 
<tr> 
<td id=demo2 valign=top></td> 
</tr> 
</table> 

</div> 
<script> 
var speed=15 
demo2.innerHTML=demo1.innerHTML//克隆demo1為demo2 
function Marquee(){ 
if(demo2.offsetHeight-demo.scrollTop<=0)//當滾動至demo1與demo2交界時 
demo.scrollTop-=demo1.offsetHeight//demo跳到最頂端 
else{ 
demo.scrollTop++  //如果是橫向的 將 所有的 height top 改成 width left 
} 
} 
var MyMar=setInterval(Marquee,speed)//設置定時器 
demo.onmouseover=function() {clearInterval(MyMar)}//鼠標移上時清除定時器達到滾動停止的目的 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}//鼠標移開時重設定時器 
</script>