public function loginAction() {
    if ($this->getRequest()->isPost()) {
        $session = $this->_getSession();
        if (Mage::getSingleton ( 'customer/session' )->isLoggedIn ()) {
            $session->logout ();
        }

        $username = Mage::app ()->getRequest ()->getParam ( 'username' );
      $password = Mage::app ()->getRequest ()->getParam ( 'password' );

        try {
      if ($session->getCustomer()->getIsJustConfirmed()) {
            if (!$session->login ( $username, $password )) {
                echo json_encode(array('status' => 'error','message'=> $this->__('wrong username or password.')));
                exit;
            } else {

                echo json_encode(array('status' => 'success','message'=>$this->statusAction ()));
                exit;
            }
      }else {
        echo 'bla bla bla';
      }
        } catch ( Mage_Core_Exception $e ) {
            switch ($e->getCode ()) {
                case Mage_Customer_Model_Customer::EXCEPTION_EMAIL_NOT_CONFIRMED :
                    //$value = Mage::helper ( 'customer' )->getEmailConfirmationUrl ( $username );
                    $message = Mage::helper ( 'customer' )->__ ( 'This account is not confirmed.');
                    echo json_encode ( array (
                            'status' => 'error',
                            'message' =>  $this->__($message )
                    ) );
                    break;
                case Mage_Customer_Model_Customer::EXCEPTION_INVALID_EMAIL_OR_PASSWORD :
                    $message = $e->getMessage ();
                    echo json_encode ( array (
                            'status' => 'error',
                            'message' => $this->__($message )
                    ) );
                    break;
                default :
                    $message = $e->getMessage ();
                    echo json_encode ( array (
                            'status' => 'error',
                            'message' => $this->__($message )
                    ) );
            }
        }
  }
}