滚动字幕效果

<div id="body" style="width:200px;height:10px;">
<div id="demo3" style=overflow:hidden;height:<%=hhheight%>;width:600;>
<div id="demo4">
<table width="100%" height="100%">
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
<tr><td>滚滚滚滚滚滚滚</td</tr>
</table>
</div>
<div id="demo5"></div>
</div>
<script language="javascript">
var i=0;
var speed1=80
var demo5=document.getElementById(&#39;demo5&#39;);
demo5.innerHTML=demo4.innerHTML
function Marquee1(){
if(demo5.offsetTop-demo3.scrollTop<=0)
demo3.scrollTop-=demo4.offsetHeight
else{
demo3.scrollTop++
}
i++;
//alert(i);
}
var MyMar1=setInterval(Marquee1,speed1)
demo3.onmouseover=function() {clearInterval(MyMar1)}
demo3.onmouseout=function() {MyMar1=setInterval(Marquee1,speed1)}
</script>