图片无缝滚动兼容IE7,IE8,FOX,不兼容IE6，求大虾帮忙！！！

Question

<div id="demo">
<table border="0" cellpadding="0" cellspacing="0">
<tr><td id="demo1">
<% Call ShowProductList0107() %>
</td>
<td id="demo2"></td></tr>
</table>
</div>
<script type="text/javascript">
var speed = 10;
document.getElementById("demo2").innerHTML = document.getElementById("demo1").innerHTML;
function ImgMarquee()
{
if(document.getElementById("demo2").offsetWidth-document.getElementById("demo").scrollLeft<=0)
{
document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth;
}
else
{
document.getElementById("demo").scrollLeft++;
}
}
var Marquee = setInterval("ImgMarquee()",speed);
</script>