function addEmail()
{
  if(isset($_REQUEST['email']) && ($email = $_REQUEST['email']) != ''){
    $query  = "INSERT INTO email (email) VALUES ('$email')";
    
    if($result = $this->dbo->exec($query)){
      $this->setMessage('Podany e-mail zosta dopisany do bazy.');
    }
    else{
      $this->setMessage('Ten e-mail nie moe by dopisany do bazy.');
    }
  }
  else{
    $this->setMessage('Podaj prawidowy adres e-mail.');
  }
}