[Buddha]

i would just add a
< table >< tr >< td > with the image set as the background for that < td > in the header and set the width, then < td > and then the rest of your forum (it'll be within this last < td >.
then in the footer, at the very bottom, add < /td >< td > and set the same info for the image that you want as the right border in that last < td >. then end it with < /td > < /tr > < /table >

remove the obvious spaces, set the parameters as to how wide you want everything as well as the colors, and then you're set.

basically all you have to do is set your entire forum (from header down to the footer) within another table... more specifically, nested within the middle < td > of another table.

<table>
 <tr>
  <td>  <-- this is your left border
    </td>
   <td>  <-- this is your forum
     </td>
    <td>  <-- this is your right border
      </td>
  </tr>
</table>