porque este codigo se ve diferente en IE o FIREFOX

[animaliens]

Ayuda, por favor... no se porque se ve diferente en IE, en FIREFOX se ve como deberia verse:

Código:

<table width="1002" border="0" cellpadding="0" cellspacing="0">
  <tr>
    <td width="786" height="1551" valign="top"><table width="100%" height="1405" border="0" cellpadding="0" cellspacing="0">
      <tr>
        <td height="147" colspan="2" bgcolor="#E3E2E7"><img src="imagenes/nuevo-6.png" width="786" height="147"></td>
        </tr>
      <tr>
        <td width="473" height="5" valign="top" background="imagenes/bajocabezal.gif"><img src="imagenes/bajocabezal.gif" width="1" height="5"></td>
        <td width="314" rowspan="2" valign="top"><img src="imagenes/flash.png" width="314" height="284"></td>
      </tr>
      <tr>
        <td height="852" valign="top"><table width="472" height="203"  border="0">
          <tr>
            <td width="38" height="193" rowspan="2" align="right" valign="top"><table width="100%" height="186"  border="0">
              <tr>
                <td height="12" colspan="2" valign="top">&nbsp;</td>
              </tr>
              <tr>
                <td width="24" height="153" align="left" valign="top"><span class="nuevaHoranews"><?php echo FormatoFecha($row_destacada["Fecha"])?></span>                </td>
                <td width="4" align="left" valign="top"><img border="0" src="imagenes/lineahora.gif" width="4" height="20"></td>
              </tr>
            </table></td>
            <td width="424" height="12">&nbsp;</td>
          </tr>
          <tr>
            <td height="146"><table width="786%" height="110%"  border="0">
              <tr>
                <td width="248" height="154" valign="top" class="tituloNota1bwn"><p><a href="detalle.php?id_noticia=<?php echo $row_destacada["ID_Noticia"];?>"><?php echo $row_destacada["Titulo"];?></a></p>
                  <p><span class="NoticiasCopeteNew"><?php echo substr($row_destacada["Copete"],0,70)."...";?></span></p></td>
                <td width="162" align="left" valign="top"><?php

$ruta="/diariobolson/".ObtenerCarpeta($row_destacada["Fecha"], $row_destacada["ImagenDestacado"]);
 ?> <img src="<?php echo $ruta;?>" alt="<?php echo $row_destacada["Desc_Imagen"];?>" width="158" height="146"></td>
              </tr>
              <tr>
                <td height="13" colspan="2" valign="top"><table width="100%"  border="0">
                  <tr>
                    <td width="98%" background="imagenes/urlsfondo.gif"><img src="imagenes/urlstransp.gif" width="1" height="13"></td>
                    <td width="2%"><img src="imagenes/urlstransp.gif" width="10" height="13"></td>
                  </tr>
                </table></td>
              </tr>
            </table></td>
          </tr>
        </table></td>
      </tr>
      <tr>
        <td height="400" colspan="2" valign="top">&nbsp;</td>
      </tr>
      
    </table></td>
    <td width="216">&nbsp;</td>
  </tr>
</table>