public function switchAction()
{
$this->_helper->viewRenderer->setNoRender();
$id = trim($this->getRequest()->getParam('id'));
if (isset($this->authidentity) && $this->authidentity->userid != $id) {
$userModel = new Application_Model_Users($this->registry->DB);
$userModel->switchUser($id);
echo json_encode(array('status' => 'success'));
} else {
echo json_encode(array('status' => 'error'));
}
}