在ASP.Net中用了marquee的时候图片循环但是不能连续循环，请大家帮忙解决啊

<marquee onmouseover="stop()" onmouseout="start()" direction="left" scrolldelay="200">

      <nobr>

           <asp:DataList id="rptCase" runat="server" RepeatDirection="Horizontal">

               <ItemTemplate>
                    <table>
                       <tr>
                           <td><a href='bigcases.aspx?Id=<%#Eval("case_Id") %>' target="_blank"><img alt='<%#Eval("case_Name") %>' src='Uploads/Image/<%#Eval("case_Image") %>' onmouseover="doit(true)" onmouseout="doit(false)" style="width:160px; height:100px;" /></a><br />
                           </td>
                      </tr>
                      <tr>
                          <td align="center"><a href='bigcases.aspx?Id=<%#Eval("case_Id") %>'target="_blank" style="text-decoration:none; color:#aa051d;">  <%#Eval("case_Name")%></a>
                         </td>
                     </tr>
                 </table>
            </ItemTemplate>
         </asp:DataList>

      </nobr>

</marquee>