Problemas con XHTML 1.0

[Reynier]

Código PHP:

  <tr> 
                        <td valign="top" align="right">Informaci&oacute;n extra:</td> 
                        <td align="left"><textarea name="uextrainformacion" cols="50" rows="5" wrap="VIRTUAL" id="uextrainformacion"></textarea></td> 
                      </tr> 
                      <tr> 
                        <td valign="top" align="right">Firma:</td> 
 
                        <td align="left"> 
                         <textarea name="ufirma" cols="50" rows="5" wrap="VIRTUAL" id="ufirma"></textarea> 
                        </td> 
                      </tr> 
                      <tr> 
                        <td colspan="2" align="center"><hr class="hr"/></td> 
                      </tr> 
                      <tr> 
                        <td colspan="2"> 
 
                         <input name="umailpublic" checked type="checkbox" id="umailpublic" value="1"/>Mostrar correo p&uacute;blico 
                        </td> 
                        </tr> 
                      <tr> 
                        <td colspan="2"><input name="usign" checked type="checkbox" id="usign" value="1"/>Usar firma en todos los mensajes</td> 
                      </tr> 
                      <tr> 
                        <td colspan="2"><input name="ureceiveboletin" checked type="checkbox" id="ureceiveboletin" value="1"/>Recibir bolet&iacute;n del Portal por correo electr&oacute;nico</td> 
 
                      </tr> 
                      <tr> 
                        <td colspan="2"> 
                         <input name="unotifiymail" type="checkbox" id="unotifiymail" value="1"/>Notificar mensajes privados y/o respuestas mediante correo electr&oacute;nico 
                        </td> 
                        </tr> 
                      <tr> 
                        <td colspan="2" align="right"><hr class="hr"/></td> 
                        </tr> 
 
                      <tr> 
                        <td align="right">Avatar de Usuario:</td> 
                        <td align="left"><input name="uavataruploaded" type="file" id="uavataruploaded" size="35"/></td> 
                      </tr> 
                      <tr> 
                        <td colspan="2" align="center"><hr class="hr"/></td> 
                      </tr> 
                      <tr> 
 
                        <td colspan="2" align="center"><input name="ubtn_send" type="button" id="ubtn_send" value="Continuar :&gt;" onclick="javascript:return validateForm();"  /></td> 
                    </tr> 
                    </table> 
                </form> 
                </td> 
            </tr> 
        </table> 
    </td> 
</tr>     <tr> 
 
   <td align="center" class="topnav" colspan="2">Todos los derechos reservados &copy; 2005 - Joven Club de Computaci&oacute;n y Electr&oacute;nica de Granma</td> 
 </tr> 
</table> 
</body> 
</html>