puede ser asi
Código PHP:
<tr>
<td rowspan="23"><img src="images/principal_r5_c3.gif" alt="" name="principal_r5_c3" width="175" height="318" border="0"></td>
<td><img src="images/spacer.gif" alt="" width="1" height="6" border="0"></td>
</tr>
<tr>
<td colspan="2"><img src="images/principal_r6_c1.gif" alt="" name="principal_r6_c1" width="149" height="4" border="0"></td>
<td><img src="images/spacer.gif" alt="" width="1" height="4" border="0"></td>
</tr>
<tr>
<td rowspan="2" colspan="2"><a href="#" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('Image64','','images/gif%20reglamento/reglamento.gif',1)"><img src="images/principal_r7_c1.gif" alt="Reglamento Nivel I y II" name="Image64" width="149" height="23" border="0"></a></td>
<td><img src="images/spacer.gif" alt="" width="1" height="8" border="0"></td>
</tr>
<tr>
<td rowspan="20" background="images/principal_r8_c4.jpg">
<div align="center">
<iframe name="ABRETESESAMO" src="inicio.html" width="426" height="300" marginwidth="0" marginheight="0" frameborder="0">
</iframe>
</div>
</td>
<td><img src="images/spacer.gif" alt="" width="1" height="15" border="0"></td>
</tr>
<tr>
<td colspan="2"><img src="images/principal_r9_c1.gif" alt="" name="principal_r9_c1" width="149" height="4" border="0"></td>
<td><img src="images/spacer.gif" alt="" width="1" height="4" border="0"></td>
</tr>
<tr>
o asi
Código PHP:
</tr>
<tr>
<td rowspan="20" background="images/principal_r8_c4.jpg">
AQUI TU TEXTO
</td>
<td><img src="images/spacer.gif" alt="" width="1" height="15" border="0"></td>
</tr>
<tr>