I have a problem closing the br tags as they are in a php tide processor script and I'm not sure where to find them to alter them. The missing image one was an oversight having been using HTML strict and this site is XHTML.

I am now down to 1 error unless the wunderground link defaults.

not allowed <tfoot>

this is the code as i'm not sure what I have done wrong.

<table>
<thead>
  <tr>
    <th colspan="4">Tidal Predictions</th>
  </tr>
  </thead>
  <tbody>
  <tr>
    <td><?php tides(0); ?></td>
    <td><?php tides(1); ?></td>
    <td><?php tides(2); ?></td>
    <td><?php tides(3); ?></td>
  </tr>
  <tr>
    <td><?php tides(4); ?></td>
    <td><?php tides(5); ?></td>
    <td><?php tides(6); ?></td>
    <td><?php tides(7); ?></td>
  </tr>
  <tr>
    <td><?php tides(8); ?></td>
    <td><?php tides(9); ?></td>
    <td><?php tides(10); ?></td>
    <td><?php tides(11); ?></td>
  </tr>
  <tr>
    <td><?php tides(12); ?></td>
    <td><?php tides(13); ?></td>
    <td><?php tides(14); ?></td>
    <td><?php tides(15); ?></td>
  </tr>
  <tr>
    <td><?php tides(16); ?></td>
    <td><?php tides(17); ?></td>
    <td><?php tides(18); ?></td>
    <td><?php tides(19); ?></td>
  </tr>
</tbody>
<tfoot>
<tr>
<td colspan="4">
<?php tidesv(); ?>
</td>
</tr>
</tfoot>
</table>

Thanks for that, also found http://www.w3schools.com/tags/tag_tfoot.asp
The page now validates, but I'm still left with one of the borders missing, or at least it is in Firefox, not checked the others yet.

It is the border between the first and second row and appears to only be a Firefox issue, checked all the others and they are fine.