function moveUploadedFile($dest, $fileName = '')
    {
        if ($dest != ''  && substr($dest, -1) != '/') {
            $dest .= '/';
        }
        $fileName = ($fileName != '') ? $fileName : basename($this->_value['name']);
        if (move_uploaded_file($this->_value['tmp_name'], $dest . $fileName)) {
            return true;
        } else {
            return false;
        }
    }