function display($tpl = null)
{
$uid = JRequest::getString('uid', '');
$nid = JRequest::getString('nid', '');
$user = JFactory::getUser();
$subscriber = JModel::getInstance('Subscriber', 'NewsletterModelEntity');
if (!empty($uid)) {
$subscriber->load(array('subscription_key' => $uid));
} elseif (!empty($user->id)) {
$subscriber->load('-' . $user->id);
}
$lists = SubscriberHelper::getLists($subscriber->subscription_key);
$this->assignRef('user', $user);
$this->assignRef('subscriber', $subscriber->toObject());
$this->assignRef('lists', $lists);
$this->assign('uid', $subscriber->subscription_key);
$this->assign('nid', $nid);
$this->setDocument();
parent::display();
}