-<form action="index.php?form=login" method="post">
+<form action="index.php" method="post">
+ <input type="hidden" name="form" value="login" />
<p>Email : <input type="text" name="email" /></p>
<p>Mot de passe : <input type="text" name="password" /></p>
<p><input type="submit" value="OK"></p>