public function login()
    {
        // Este también funciona perfect. :D
        $d['titulo'] = 'Mangani.me - Loguearse';
        $this->load->library('form_validation');
        $this->form_validation->set_rules('username', 'Username', 'required');
        $this->form_validation->set_rules('password', 'Password', 'required');
        $d['contenido'] = '<form method="post" accept-charset="utf-8"><table border="0" cellspacing="0" cellpadding="5">'."\n";
        $d['contenido'] .= '<tr><td><strong>Nickname:</strong></td>';
        $data = array(
            'name'        => 'username',
            'id'          => 'username',
            'value'       => '',
            'size'        => '20',
            );
        $d['contenido'] .= '<td>'.form_input($data).'</td></tr>'."\n".'<tr><td><strong>Contraseña:</strong><td>';
        $data2 = array(
            'name'        => 'password',
            'type'          => 'password',
            'value'       => '',
            'size'        => '20',
            );
        $d['contenido'] .= form_input($data2) . '</td></tr>'."\n".'<tr><td>'. form_submit('submit', '¡Loguearme!') .'</td></tr></table>'. form_close();
        if ($this->form_validation->run() == FALSE)
        {
            $this->load->view('form', $d);
        }
        else
        {
            $query = $this->db->query("SELECT * FROM users WHERE username='".$this->input->post('username')."' AND password='".md5($this->input->post('password'))."' LIMIT 0,1");
            $user = $query->row();
            $this->db->query("DELETE FROM sessions WHERE ip='".$this->db->escape_str($this->user->ipaddress)."' AND sid != '".$this->user->sid."'");
            $this->db->query("UPDATE sessions SET uid='".$user->uid."' WHERE sid='".$this->user->sid."'");
            $this->input->set_cookie('mnuser', $user->uid."_".$user->loginkey, time()+3600, '.redmangani.me', '/', '', true);
            $this->input->set_cookie('mnsid', $this->user->sid, time()+3600, '.redmangani.me', '/', '', true);
            header('Location: index');
        }
    }
    public function logout()
    {
        // Este funciona perfect. :D
        global $user;
        $this->input->set_cookie('mnuser', '', -3600, '.redmangani.me', '/', '', true);
        $this->input->set_cookie('mnsid', '', -3600, '.redmangani.me', '/', '', true);
        if($user->uid)
        {
            $time = time() - 900;
            $this->db->delete('sessions', array('sid' => $this->user->sid));
            $this->db->query("UPDATE users SET lastactive='".$time."' WHERE uid='".$user->uid."'");
        }
        header('Location: index');
    }