(초보) 회원가입폼에 여분필드를 이용하여 체크박스를 만들었는데요.

<tr>  <td>    <span><b>체크박스</b></span>       <u           <li><input type=checkbox name=mb_3 value="전체" <?=$write[mb_3 ]?>>전체</li>           <li><input type=checkbox name=mb_3 value="메뉴1" <?=$write[mb_3 ]?>>메뉴1</li>           <li><input type=checkbox name=mb_3 value="메뉴2" <?=$write[mb_3 ]?>>메뉴2</li>           <li><input type=checkbox name=mb_3 value="메뉴3" <?=$write[mb_3 ]?>>메뉴3</li>           <li><input type=checkbox name=mb_3 value="메뉴4" <?=$write[mb_3 ]?>>메뉴4</li>           <li><input type=checkbox name=mb_3 value="메뉴5" <?=$write[mb_3 ]?>>메뉴5</li>           <li><input type=checkbox name=mb_3 value="없음" <?=$write[mb_3 ]?>>없음 </li>       </ul>   </td></tr>