javascript横向连续滚动

 <div id="demo" style="OVERFLOW: hidden; WIDTH: 100%; align: center">
    <table cellspacing=0 cellpadding=0 align=center border=0>
        <tr>
            <td id="demo1" align="middle">
               文章内容
             </td>
             <td id=demo2></td>
         </tr>
    </table>
</div>

<!-- 以下是javascript代码 -->
<SCRIPT language=javascript>
Marquee();
var speed=1
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>