public function config()
 {
     parent::config();
     $this->setName('login');
     $this->senha = new Izi_Form_Element_Password('senha', array('label' => 'senha', 'class' => 'text', 'validators' => array(array('StringLength', false, array(0, 32))), 'required' => true));
     $this->addElement('hidden', 'referer', array('label' => 'referer', 'validators' => array(new Izi_Validate_Uri()), 'required' => false));
     $this->removeElement('nome');
     $this->getElement('submit')->setLabel('entrar');
 }