public function index()
  {
    if($_POST)
    {
      $post = new Validation($_POST);

      $post->add_rules('contact-nom', 'required');
      $post->add_rules('contact-email', 'required','email');
      $post->add_rules('contact-tel', 'required');
      $post->add_rules('contact-message', 'required');

      if($post->validate())
      {

      }
      else
      {
         $this->template->error = "<p id='error'>Tous les champs sont obligatoires.</p>";
      }
    }
    $this->template->content = new View('frontend/contact');
  }