private function setSession($account_type)
 {
     $result = mysql_fetch_array($this->administrator_model->getUser(trim($_POST['username']), md5(trim($_POST['password']))));
     Session::set_surname(trim($result['Surname']));
     Session::set_firstname(trim($result['First_Name']));
     Session::set_middlename(trim($result['Middle_Name']));
     Session::set_emailAdd(trim($result['email_address']));
     Session::set_photo($result['Picture']);
     Session::set_Account_type($account_type);
 }