Segni strani Firefox

[secX]

Salve a tutti!

Sto creando un sito in PHP ma ho notato un problema:
in alto, nella mia pagina ci sono dei segni strani, 
non riesco a capire da cosa dipende

il codice della pagina è:

<div align="center">
  <table width="900" border="0" cellpadding="0" cellspacing="0">
    
    <tr>
      <td width="239" height="66" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
        
        <tr>
          <td width="239" height="66" valign="top">[img]images/banner.gif[/img]</td>
          </tr>
      </table></td>
      <td width="661" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0" class="template_menu">
        
        <tr>
          <td width="661" height="28"></td>
          </tr>
        <tr>
          <td height="19" valign="top" class="website_menu" align="center"><?php Menu(""); ?></td>
          </tr>
        <tr>
          <td height="19"></td>
        </tr>
      </table></td>
    </tr>
    <tr>
      <td height="427" colspan="2" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0" class="page">
        
        <tr>
          <td width="18" height="328"></td>
          <td width="308" align="left" valign="top" class="website">[b].: news :.[/b]
            

<?php ReadNews(); ?></p></td>
          <td width="18" valign="top" style="border-left: dotted 1px #000000"></td>
          <td width="538" align="left" valign="top" class="website">
            </p>
            

Presentazione

  
</p>
            

<form action="links/" method="GET">
            Vai a: <select name="linkID">
            <option value="google.it">Google.it</option>
            </select>
            <input type="submit" value="Vai" />
            </form></p></td>
          <td width="18"></td>
        </tr>
        
        <tr>
          <td height="19"></td>
          <td colspan="3" valign="top" style="border-top: dotted 1px #000000;"></td>
          <td></td>
        </tr>
        <tr>
          <td height="152"></td>
          <td colspan="3" valign="top" class="website" align="left">

[b]Ultimi aggiornamenti: [/b]</p>
            

<?php Updates(); ?></p>
            <p align="center" style="border-top: dotted 1px #000000">


<?php Copyright(); ?></p></td>
          <td></td>
        </tr>
      </table></td>
    </tr>
    <tr>
      <td height="30" colspan="2" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0" class="template_foot">
        
        <tr>
          <td width="900" height="30"></td>
          </tr>
      </table></td>
    </tr>
    <tr>
      <td height="394"></td>
      <td></td>
    </tr>
  </table>
</div>

Grazie dell'aiuto