Hi Susanne!
Versuchs mal damit:
<table border=1>
<!-- 1. Zeile -->
<tr>
<td rowspan=3>1</td>
<td>2</td>
<td rowspan=3>5</td>
</tr>
<!-- 2. Zeile -->
<tr>
<td>3</td>
</tr>
<!-- 3. Zeile -->
<tr>
<td>4</td>
</tr>
</table>
Clemens