메인메뉴 li class 수정 하고싶은데 도움좀 주세요 채택완료

</p><p><nav id="gnb">
        <h2>메인메뉴</h2>
        <ul id="gnb_1dul">
            <?php
            $sql = " select *
                        from {$g5['menu_table']}
                        where me_use = '1'
                          and length(me_code) = '2'
                        order by me_order, me_id ";
            $result = sql_query($sql, false);
            $gnb_zindex = 999; // gnb_1dli z-index 값 설정용</p><p>            for ($i=0; $row=sql_fetch_array($result); $i++) {
            ?>
            <li class="gnb_1dli" style="z-index:<?php echo $gnb_zindex--; ?>">
                <a href="<?php echo $row['me_link']; ?>" target="_<?php echo $row['me_target']; ?>" class="gnb_1da"><?php echo $row['me_name'] ?></a>
                <?php
                $sql2 = " select *
                            from {$g5['menu_table']}
                            where me_use = '1'
                              and length(me_code) = '4'
                              and substring(me_code, 1, 2) = '{$row['me_code']}'
                            order by me_order, me_id ";
                $result2 = sql_query($sql2);</p><p>                for ($k=0; $row2=sql_fetch_array($result2); $k++) {
                    if($k == 0)
                        echo '<ul class="gnb_2dul">'.PHP_EOL;
                ?>
                    <li class="gnb_2dli"><a href="<?php echo $row2['me_link']; ?>" target="_<?php echo $row2['me_target']; ?>" class="gnb_2da"><?php echo $row2['me_name'] ?></a></li>
                <?php
                }</p><p>                if($k > 0)
                    echo '</ul>'.PHP_EOL;
                ?>
            </li>
            <?php
            }</p><p>            if ($i == 0) {  ?>
                <li id="gnb_empty">메뉴 준비 중입니다.<?php if ($is_admin) { ?> 
<a href="<?php echo G5_ADMIN_URL; ?>/menu_list.php">관리자모드 > 환경설정 > 메뉴설정</a>에서 설정하실 수 있습니다.<?php } ?></li>
            <?php } ?>
        </ul>
    </nav></p><p>