public function showAll()
        {
            $query = mysql_query("SELECT `username`, `password` FROM `user` ORDER BY `id` DESC");


            $arr = array();
            while($result = mysql_fetch_assoc($query))
            {
                $arr[] = $result;
                $this->username = $result['username'];
                $this->password = $result['password'];
            }
        }