Plusieurs choix pour mon formulaire

<?php
require("conf.php");

if(isset($_POST) && !empty($_POST['login']) && !empty($_POST['password'])) {
  extract($_POST);
  // on recupère le password de la table qui correspond au login du visiteur
  $sql = "select password from users where login='".$login."'";
  $con = "select contrat from users where login='".$login."'";
  $req = mysql_query($sql) or die('Erreur SQL !<br>'.$sql.'<br>'.mysql_error());

  $data = mysql_fetch_assoc($req);

  if($data['password'] != $password) {
        echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="connect.php" </SCRIPT>';
    exit;
  }
  else if ($con == tec) {
    session_start();
    $_SESSION['login'] = $login;
    
    echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="tec_s3a/login_tec.php" </SCRIPT>'; 
  }    
  else if ($con == ce) {
    session_start();
    $_SESSION['login'] = $login;
    
    echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="CE/login_ce.php" </SCRIPT>'; 
}
else if ($con == ca) {
    session_start();
    $_SESSION['login'] = $login;
    
    echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="ca/login_ca.php" </SCRIPT>'; 
}

else if ($con == admin) {
    session_start();
    $_SESSION['login'] = $login;
    
    echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="admin/login_admin.php" </SCRIPT>'; 
}
else if ($con == administration) {
    session_start();
    $_SESSION['login'] = $login;
    
    echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="administation/login_administration.php" </SCRIPT>'; 
}
else if ($con == inter) {
    session_start();
    $_SESSION['login'] = $login;
    
    echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="inter/inter.php" </SCRIPT>'; 
}
else {
   echo '<SCRIPT LANGUAGE="JavaScript">
document.location.href="connect1.php" </SCRIPT>';
   exit;
}
}

?>