Datalist无隙滚动

      <div id="demo" style="overflow: hidden; width:636px; color: #ffffff; height: 90px;">
                                    <table border="0" cellpadding="0" cellspacing="0" class="line2" style="margin-top: 5px; width:612px;">
                                       <tr>
                                        <td style="height:2px">
                                       
                                       </td>
                                       </tr>
                                        <tr>
                                        
                                               <td id="demo2"  style="height: 90px" valign="middle"  >
                                        </td>
                                        
                                              <td id="demo1" align="center" style="height: 90px" valign="middle">
                                           
                                              
        
        <asp:DataList ID="DataList3" runat="server" RepeatDirection="Horizontal" RepeatColumns="8" Width="620px">
           <ItemTemplate>
           <table><tr><td style="width:145px" valign="middle" >
            <a href='<%#Eval("imgUrl") %>'>
            <img height="91px" width="140" src='<%#Eval("imgUrl") %>' style="border-style: none" /></a>
       
           </td></tr></table>
           </ItemTemplate>
           
           </asp:DataList>
           </td>
                                   
 </tr>
                                        
                                    </table>
                                    </div>
                                    
                                    <script type="text/javascript">
             var speed=20
             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)}
function IMG1_onclick() {

}

                                            </script>