Rad menu inside Div inside table cell in ie7

Question

I create the layout for my website using table and I have a cell contain Rad menu.My problem when change Document Mode in ie9 to IE7 standards the rad menu will go outside of screen on mouse hover (when change the float of table from left to be right). the content of table cell is:

<tr>
   <td colspan="4">
      <div>
          <radM:RadMenu ID="RadMenu2" runat="server" Width="100%">
          </radM:RadMenu>
      </div>
   </td>
 </tr>