public function email_check($email) {
        $this->load->model('eloki_model');
        $check = $this->eloki_model->email_check($email);

        if ($check) {
            $this->form_validation->set_message('email_check', 'The email "' . $email . '" already exists.');
            return false;
        } else {
            return true;
        }
    }

    public function username_check($username) {
        $this->load->model('eloki_model');
        $check = $this->eloki_model->username_check($username);

        if ($check) {
            $this->form_validation->set_message('username_check', 'The username "' . $username . '" already exists.');
            return false;
        } else {
            return true;
        }
    }