Problemas con formularios en IE

[Deux_macca]

Código PHP:

  <style type="text/css"> 
<!-- 
body,td,th { 
    font-family: Geneva, Arial, Helvetica, sans-serif; 
    font-size: 10px; 
} 
body { 
    margin-left: 0px; 
    margin-top: 0px; 
    margin-right: 0px; 
    margin-bottom: 0px; 
    background-color: #333333; 
} 
a { 
    font-family: Geneva, Arial, Helvetica, sans-serif; 
    font-size: 10px; 
    color: #000000; 
} 
a:link { 
    text-decoration: none; 
} 
a:visited { 
    text-decoration: none; 
    color: #000000; 
} 
a:hover { 
    text-decoration: underline; 
    color: #739DB6; 
} 
a:active { 
    text-decoration: none; 
    color: #000000; 
} 
.style1 { 
    font-size: 14px; 
    font-weight: bold; 
} 
--> 
</style>  
   

Y el form:

Código PHP:

 <form action="Index.php?neosparty=aut_verifica.inc" method="post"> 
                  <tr> 
                    <td width="13" rowspan="5">&nbsp;</td> 
                    <td colspan="2">&nbsp;</td> 
                  </tr> 
                  <tr> 
                    <td width="157"> 
                        <div align="left"> 
                          Usuario:                                 
                         </div> 
                    </td> 
                    <td width="30"><input name="user" type="text" size="20"></td> 
                  </tr> 
                  <tr> 
                    <td>Contrase&ntilde;a:                       
                    </td> 
                    <td><input name="pass" type="password" size="20"></td> 
                  </tr> 
                  <tr> 
                    <td colspan="2"> 
                    <div align="center"> 
                    <?php 
                        include ("aut_mensaje_error.inc.php"); 
                          // Mostrar error de Autentificación. 
                          if (isset($_GET['error_login'])){ 
                              $error=$_GET['error_login']; 
                          echo "<font face='Verdana, Arial, Helvetica, sans-serif' size='1' color='#FF0000'>Error:$error_login_ms[$error]"; 
                          } 
                    ?> 
                      <br> 
                      <input type=submit name=Submit value="Entrar"> 
                    </div></td> 
                  </tr> 
                  <tr> 
                    <td colspan="2"><strong><br> 
                      <img src="images/sp.jpg" width="35" height="10"> </strong><a href="Index.php?neosparty=registro"> Registrarse</a><br> 
                    <strong><img src="images/sp.jpg" width="35" height="10"><a href="Index.php?neosparty=recordar"> Recordar contrase&ntilde;a</a></strong></td> 
                  </tr> 
                  </form>  

El formulairo esta introducido mediante un include.
Thx.