javascript 文字图片上下滚动的示例代码

<div style="border:#d3d3d3 1px solid;width:100%;">
<div id="demo" style="overflow:hidden;height:160;width:100%;">
<div id="demo1">
 文章标题列表
</div>
<div id="demo2"></div>
 </div>
</div>

<script language="javascript">
/**
* 文字图片上下滚动
* by www.jb200.com
*/
 var speed=30
 demo2.innerHTML=demo1.innerHTML
function Marquee(){
 if(demo2.offsetTop-demo.scrollTop<=0)
    demo.scrollTop-=demo1.offsetHeight
 else{
     demo.scrollTop++
 }
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>