陈东村导演:哪位高手帮我做一下注释，感激不尽。

<div id=demo style=overflow:hidden;height:120;width:515px;color:#ffffff><table align=left cellpadding=0 cellspace=0 border=0><tr>
<td id=demo1 valign=top>
<table align=center cellpadding=0 cellspace=0 border=0>
<tr>
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</tr></table>
</td>

<td id=demo2 valign=top></td>
</tr>
</table></div>

<script language='javascript'>
var speed=5
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>