codice:
<table style="width: 400px; height: 400px;">
 <tr style="height: 50px;">
  <td style="visibility: none; width: 350px;">
  </td>
  <td style="width: 50px;">
   ^^
  </td>
 </tr>
 <tr>
  <td colspan="2">
   ...
  </td>
 </tr>
</table>