Js不间断滚动-上

<div id=link_logo style="OVERFLOW: hidden; WIDTH: 600px; HEIGHT: 468px">
  <div id=link_logo1 style="OVERFLOW: hidden">
                   
                    <table width="100%" height="468" border="0" cellpadding="0" cellspacing="0">
                          <tr>
                            <td height="468" valign="top" style="color:#ffffff;line-height:25px;">
                          
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                            </td>
                           
                          </tr>
                        </table>   
                        </div>
  <div id=link_logo2></div>
</div>
                      
<script>
 var speed=65
  link_logo2.innerHTML=link_logo1.innerHTML
    function Marquee2(){
   if(link_logo2.offsetTop-link_logo.scrollTop<=0)
      link_logo.scrollTop-=link_logo1.offsetHeight
     else{
      link_logo.scrollTop++
      }
         }
         var MyMar2=setInterval(Marquee2,speed)
         link_logo.onmouseover=function() {clearInterval(MyMar2)}
         link_logo.onmouseout=function() {MyMar2=setInterval(Marquee2,speed)}
</script>