t="9" fixedsize="true" style="invis"></td>
      <td width="9" height="9" fixedsize="true" sides="ltr"></td>
      <td width="9" height="9" fixedsize="true" style="invis"></td>
     </tr>
     <tr>
      <td width="9" height="9" fixedsize="true" sides="tlb"></td>
      <td width="9" height="9" fixedsize="true" sides="b"></td>
      <td width="9" height="9" fixedsize="true" sides="brt"></td>
     </tr>
    </table>>]
</XMP>
<H2><A NAME=epsf>User-defined Nodes</A></H2>

There is a third type of node shape whi