请教向左滚动如何改成向右滚动
<div id="demo" style="OVERFLOW:hidden;WIDTH:560px;COLOR:#ffffff;HEIGHT:130px"><table cellpadding="0" cellspace="0" border="0" id="Table39" height="101">
<tr valign="middle">
<td width="560" valign="middle" id="demo1">放置的滚动内容</td>
<td width="2" valign="middle" id="demo2"></td>
</tr>
</table>
</div>
<script>
var speed=2//速度数值越大速度越慢
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetWidth-demo.scrollLeft<0)
demo.scrollLeft-=demo1.offsetWidth
else{
demo.scrollLeft++
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>
以上是从左向右无缝滚动代码,请问向上无缝滚动改哪个地方,麻烦清告诉下。谢谢。