图片不间断滚动效果

<div id=demo style=overflow:hidden;height:116;width:737;color:#F4F4F4>
<div id=demo1>
    <img src="image/001_r1_c7.jpg" width="86" height="112">
    <img src="image/001_r1_c12.jpg" width="90" height="112">
    <img src="image/001_r1_c1.jpg" width="88" height="112">
    <img src="image/001_r1_c3.jpg" width="80" height="112">
    <img src="image/001_r1_c5.jpg" width="84" height="112">
    <img src="image/001_r1_c7.jpg" width="86" height="112">
   <img src="image/001_r1_c1.jpg" width="88" height="112">
   <img src="image/001_r1_c12.jpg" width="90" height="112">
</div>
<div id=demo2></div>
</div>
<script>
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>