table structure to css divs
===

I really need help converting this simple table structure to css div's.  Is there a simple application or something.  CSS divs are driving me insane.

    <table width="100%" border="0">
      <tr>
    <td colspan="3" id="Header"></td>
     </tr>
    <tr>
    <td width="20%" id="Nav2"></td>
    <td width="40%" id="ContentMiddleLeft"></td>
    <td width="40%" id="ContentMiddleRight"></td>
     </tr>
    <tr>
    <td colspan="3" id="BottomContent"></td>
    </tr>
    </table>