diff --git a/adm/auth_list.php b/adm/auth_list.php
index a7c055263..1aba7b8ac 100644
--- a/adm/auth_list.php
+++ b/adm/auth_list.php
@@ -63,6 +63,7 @@ $colspan = 5;
         <?=$listall?>
         설정된 관리권한 <?=number_format($total_count)?>건
     </span>
+    <strong id="msg_stx" class="msg_sound_only"></strong>
     <input type="text" name="stx" value="<?=$stx?>" id="stx" title="회원아이디(필수)" required class="required frm_input">
     <input type="submit" value="검색" id="fsearch_submit" class="btn_submit">
 </fieldset>
@@ -168,12 +169,15 @@ $colspan = 5;
     <tbody>
     <tr>
         <th scope="row"><label for="mb_id">회원아이디<strong class="sound_only">필수</strong></label></th>
-        <td><input type="text" name="mb_id" value="<?=$mb_id?>" id="mb_id" title="회원아이디" required class="required frm_input"></td>
+        <td>
+            <strong id="msg_mb_id" class="msg_sound_only"></strong>
+            <input type="text" name="mb_id" value="<?=$mb_id?>" id="mb_id" title="회원아이디" required class="required frm_input">
+        </td>
     </tr>
     <tr>
         <th scope="row"><label for="au_menu">접근가능메뉴<strong class="sound_only">필수</strong></label></th>
         <td>
-            <select id="au_menu" name="au_menu" required title="접근가능메뉴">
+            <select id="au_menu" name="au_menu" required class="required" title="접근가능메뉴">
                 <option value=''>선택하세요
                 <?
                 foreach($auth_menu as $key=>$value)
diff --git a/adm/board_form.php b/adm/board_form.php
index 9d157bbde..292bb7ad4 100644
--- a/adm/board_form.php
+++ b/adm/board_form.php
@@ -127,7 +127,7 @@ $pg_anchor = "<ul class=\"anchor\">
     <tr>
         <th scope="row"><label for="bo_table">TABLE<?=$sound_only?></label></th>
         <td colspan="2">
-            <input type="text" name="bo_table" value="<?=$board['bo_table'] ?>" id="bo_table" required class="frm_input" maxlength="20" <?=$bo_table_attr?>>
+            <input type="text" name="bo_table" value="<?=$board['bo_table'] ?>" id="bo_table" required class="required frm_input" maxlength="20" <?=$bo_table_attr?>>
             <? if ($w == '') { ?>
                 영문자, 숫자, _ 만 가능 (공백없이 20자 이내)
             <? } else { ?>
diff --git a/adm/config_form.php b/adm/config_form.php
index 2051bfbb6..a1da0271b 100644
--- a/adm/config_form.php
+++ b/adm/config_form.php
@@ -661,7 +661,7 @@ $pg_anchor = "
     <legend>XSS 혹은 CSRF 방지</legend>
     <p>관리자 권한을 탈취당하는 경우를 대비하여 패스워드를 다시 한번 확인합니다.</p>
     <label for="admin_password">관리자 패스워드<strong class="sound_only">필수</strong></label>
-    <input type="password" name="admin_password" id="admin_password" class="required frm_input">
+    <input type="password" name="admin_password" id="admin_password" required class="required frm_input">
 </fieldset>
 
 <div class="btn_confirm">
diff --git a/adm/member_form.php b/adm/member_form.php
index 771e0e89c..beb5536a3 100644
--- a/adm/member_form.php
+++ b/adm/member_form.php
@@ -113,11 +113,11 @@ include_once('./admin.head.php');
     <tr>
         <th scope="row"><label for="mb_id">아이디<?=$sound_only?></label></th>
         <td>
-            <input type="text" name="mb_id" value="<?=$mb['mb_id']?>" id="mb_id"class="frm_input" size="15" maxlength="20"  <?=$required_mb_id?>>
+            <input type="text" name="mb_id" value="<?=$mb['mb_id']?>" id="mb_id" <?=$required_mb_id?> class="frm_input" size="15" maxlength="20" >
             <?if ($w=='u'){?><a href="./boardgroupmember_form.php?mb_id=<?=$mb['mb_id']?>">접근가능그룹보기</a><?}?>
         </td>
         <th scope="row"><label for="mb_password">패스워드<?=$sound_only?></label></th>
-        <td><input type="password" name="mb_password" id="mb_password" class="frm_input" size="15" maxlength="20" <?=$required_mb_password?>></td>
+        <td><input type="password" name="mb_password" id="mb_password" <?=$required_mb_password?> class="frm_input" size="15" maxlength="20"></td>
     </tr>
     <tr>
         <th scope="row"><label for="mb_name">이름(실명)<strong class="sound_only">필수</strong></label></th>
diff --git a/adm/point_list.php b/adm/point_list.php
index 036b4a198..d46f07829 100644
--- a/adm/point_list.php
+++ b/adm/point_list.php
@@ -96,7 +96,7 @@ function point_clear()
         <option value="mb_id"<?=get_selected($_GET['sfl'], "mb_id");?>>회원아이디</option>
         <option value="po_content"<?=get_selected($_GET['sfl'], "po_content");?>>내용</option>
     </select>
-    <input type="text" name="stx" class="required frm_input" required value="<?=$stx?>" title="검색어(필수)">
+    <input type="text" name="stx" value="<?=$stx?>" title="검색어(필수)" required class="required frm_input">
     <input type="submit" class="btn_submit" value="검색">
 </fieldset>
 </form>
diff --git a/adm/poll_form.php b/adm/poll_form.php
index 5f891988c..50c35238f 100644
--- a/adm/poll_form.php
+++ b/adm/poll_form.php
@@ -34,7 +34,7 @@ include_once('./admin.head.php');
     <tbody>
     <tr>
         <th scope="row"><label for="po_subject">투표 제목<strong class="sound_only">필수</strong></label></th>
-        <td><input type="text" name="po_subject" value="<?=$po['po_subject']?>" id="po_subject" class="required frm_input" size="80" maxlength="125"></td>
+        <td><input type="text" name="po_subject" value="<?=$po['po_subject']?>" id="po_subject" required class="required frm_input" size="80" maxlength="125"></td>
     </tr>
 
     <?
@@ -51,7 +51,7 @@ include_once('./admin.head.php');
     <tr>
         <th scope="row"><label for="po_poll<?=$i?>">항목 <?=$i?><?=$sound_only?></label></th>
         <td>
-            <input type="text" name="po_poll<?=$i?>" value="<?=$po_poll?>" id="po_poll<?=$i?>" class="frm_input <?=$required?>" maxlength="125">
+            <input type="text" name="po_poll<?=$i?>" value="<?=$po_poll?>" id="po_poll<?=$i?>" required class="frm_input <?=$required?>" maxlength="125">
             <label for="po_cnt<?=$i?>">항목 <?=$i?> 투표수</label>
             <input type="text" name="po_cnt<?=$i?>" value="<?=$po['po_cnt'.$i]?>" id="po_cnt<?=$i?>" class="frm_input" size="3">
        </td>
diff --git a/adm/poll_list.php b/adm/poll_list.php
index 2ff55aa3a..b828c347a 100644
--- a/adm/poll_list.php
+++ b/adm/poll_list.php
@@ -64,7 +64,7 @@ $colspan = 6;
     <select name="sfl" id="sfl" title="검색대상">
         <option value="po_subject"<?=get_selected($_GET['sfl'], "po_subject");?>>제목</option>
     </select>
-    <input type="text" name="stx" value="<?=$stx?>" title="검색어(필수)" class="required frm_input" required>
+    <input type="text" name="stx" value="<?=$stx?>" title="검색어(필수)" required class="required frm_input">
     <input type="submit" class="btn_submit" value="검색">
 </fieldset>
 </form>
diff --git a/skin/board/basic/view_comment.skin.php b/skin/board/basic/view_comment.skin.php
index 9b1460fbc..3f04e8703 100644
--- a/skin/board/basic/view_comment.skin.php
+++ b/skin/board/basic/view_comment.skin.php
@@ -116,7 +116,7 @@ var char_max = parseInt(<?=$comment_max?>); // 최대
             <th scope="row">내용</th>
             <td>
                 <? if ($comment_min || $comment_max) { ?><strong id="char_cnt"><span id="char_count"></span>글자</strong><?}?>
-                <textarea id="wr_content" name="wr_content" required
+                <textarea id="wr_content" name="wr_content" required class="required'
                 <? if ($comment_min || $comment_max) { ?>onkeyup="check_byte('wr_content', 'char_count');"<?}?> title="댓글내용입력(필수)"><? echo $c_wr_content; ?></textarea>
                 <? if ($comment_min || $comment_max) { ?><script> check_byte('wr_content', 'char_count'); </script><?}?>
             </td>
diff --git a/skin/board/gallery/view_comment.skin.php b/skin/board/gallery/view_comment.skin.php
index c85548b8f..bf7bce66d 100644
--- a/skin/board/gallery/view_comment.skin.php
+++ b/skin/board/gallery/view_comment.skin.php
@@ -116,7 +116,7 @@ var char_max = parseInt(<?=$comment_max?>); // 최대
             <th scope="row">내용</th>
             <td>
                 <? if ($comment_min || $comment_max) { ?><strong id="char_cnt"><span id="char_count"></span>글자</strong><?}?>
-                <textarea name="wr_content" id="wr_content" required
+                <textarea name="wr_content" id="wr_content" required class="required"
                 <? if ($comment_min || $comment_max) { ?>onkeyup="check_byte('wr_content', 'char_count');"<?}?> title="댓글내용입력(필수)"><? echo $c_wr_content; ?></textarea>
                 <? if ($comment_min || $comment_max) { ?><script> check_byte('wr_content', 'char_count'); </script><?}?>
             </td>
diff --git a/skin/board/gallery/write.skin.php b/skin/board/gallery/write.skin.php
index 610c87fc5..d356c4386 100644
--- a/skin/board/gallery/write.skin.php
+++ b/skin/board/gallery/write.skin.php
@@ -60,7 +60,7 @@ echo $option_hidden;
 <? if ($is_password) { ?>
 <tr>
     <th scope="row"><label for="wr_password">패스워드<strong class="sound_only">필수</strong></label></th>
-    <td><input type="password" name="wr_password" id="wr_password" class="frm_input" maxlength="20" <?=$password_required?>></td>
+    <td><input type="password" name="wr_password" id="wr_password" <?=$password_required?> class="required frm_input" maxlength="20"></td>
 </tr>
 <? } ?>
 
diff --git a/skin/member/basic/member_confirm.skin.php b/skin/member/basic/member_confirm.skin.php
index 68ec42bdf..8fd693ac9 100644
--- a/skin/member/basic/member_confirm.skin.php
+++ b/skin/member/basic/member_confirm.skin.php
@@ -19,7 +19,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
         <span id="mb_confirm_id"><?=$member[mb_id]?></span>
 
         <label for="confirm_mb_password">패스워드<strong class="sound_only">필수</strong></label>
-        <input type="password" name="mb_password" id="confirm_mb_password" required class="fs_input" size="15" maxLength="20">
+        <input type="password" name="mb_password" id="confirm_mb_password" required class="required fs_input" size="15" maxLength="20">
         <input type="submit" value="확인" id="btn_submit" class="fs_submit">
     </fieldset>
 
diff --git a/skin/member/basic/memo_form.skin.php b/skin/member/basic/memo_form.skin.php
index aae90eb56..75bc91b01 100644
--- a/skin/member/basic/memo_form.skin.php
+++ b/skin/member/basic/memo_form.skin.php
@@ -25,7 +25,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
         </tr>
         <tr>
             <th scope="row"><label for="me_memo">내용</label></th>
-            <td><textarea name="me_memo" id="me_memo" required><?=$content?></textarea></td>
+            <td><textarea name="me_memo" id="me_memo" required class="required"><?=$content?></textarea></td>
         </tr>
         <tr>
             <th scope="row">자동등록방지</th>
diff --git a/skin/member/basic/password_lost.skin.php b/skin/member/basic/password_lost.skin.php
index 0f2803ded..4644fc34a 100644
--- a/skin/member/basic/password_lost.skin.php
+++ b/skin/member/basic/password_lost.skin.php
@@ -12,7 +12,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
             해당 이메일로 아이디와 패스워드 정보를 보내드립니다.
         </p>
         <label for="mb_email">E-mail 주소<strong class="sound_only">필수</strong></label>
-        <input type="text" name="mb_email" id="mb_email" required class="frm_input email" size="30">
+        <input type="text" name="mb_email" id="mb_email" required class="required frm_input email" size="30">
     </fieldset>
     <?=captcha_html(); ?>
     <div class="btn_win">
diff --git a/skin/member/basic/register_form.skin.php b/skin/member/basic/register_form.skin.php
index 7ccfae9b7..183d22991 100644
--- a/skin/member/basic/register_form.skin.php
+++ b/skin/member/basic/register_form.skin.php
@@ -21,17 +21,17 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
     <th scope="row"><label for="reg_mb_id">아이디<strong class="sound_only">필수</strong></label></th>
     <td>
         <span class="frm_info">영문자, 숫자, _ 만 입력 가능. 최소 3자이상 입력하세요.</span>
-        <input type="text" name="mb_id" value="<?=$member['mb_id']?>" id="reg_mb_id"  class="frm_input minlength_3 <?=$required?> <?=$readonly?>"maxlength="20" <?=$required?> <?=$readonly?>>
+        <input type="text" name="mb_id" value="<?=$member['mb_id']?>" id="reg_mb_id" <?=$required?> <?=$readonly?> class="frm_input minlength_3 <?=$required?> <?=$readonly?>"maxlength="20">
         <span id="msg_mb_id"></span>
     </td>
 </tr>
 <tr>
     <th scope="row"><label for="reg_mb_password">패스워드<strong class="sound_only">필수</strong></label></th>
-    <td><input type="password" name="mb_password" id="reg_mb_password" class="frm_input minlength_3 <?=$required?>" maxlength="20" <?=$required?>></td>
+    <td><input type="password" name="mb_password" id="reg_mb_password" <?=$required?> class="frm_input minlength_3 <?=$required?>" maxlength="20"></td>
 </tr>
 <tr>
     <th scope="row"><label for="reg_mb_password_re">패스워드 확인<strong class="sound_only">필수</strong></label></th>
-    <td><input type="password" name="mb_password_re" id="reg_mb_password_re" class="frm_input minlength_3 <?=$required?>" maxlength="20" <?=$required?>></td>
+    <td><input type="password" name="mb_password_re" id="reg_mb_password_re" <?=$required?> class="frm_input minlength_3 <?=$required?>" maxlength="20"></td>
 </tr>
 </table>
 
@@ -41,7 +41,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
     <th scope="row"><label for="reg_mb_name">이름<strong class="sound_only">필수</strong></label></th>
     <td>
         <? if ($w=='') { echo "<span class=\"frm_info\">공백없이 한글만 입력하세요.</span>"; } ?>
-        <input name="mb_name" value="<?=$member['mb_name']?>" id="reg_mb_name" class="frm_input hangul nospace <?=$required?> <?=$readonly?>" size="10" <?=$required?> <?=$readonly?>>
+        <input name="mb_name" value="<?=$member['mb_name']?>" id="reg_mb_name" <?=$required?> <?=$readonly?> class="frm_input hangul nospace <?=$required?> <?=$readonly?>" size="10">
     </td>
 </tr>
 <? if ($req_nick) { ?>
diff --git a/skin/member/basic/zip.skin.php b/skin/member/basic/zip.skin.php
index b521637e8..f1812bcef 100644
--- a/skin/member/basic/zip.skin.php
+++ b/skin/member/basic/zip.skin.php
@@ -14,7 +14,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 
     <fieldset>
         <label for="addr1">동/읍/면/리 검색</label>
-        <input type="text" name="addr1" value="<?=$addr1?>" id="addr1" required  class="fs_input" minlength="2">
+        <input type="text" name="addr1" value="<?=$addr1?>" id="addr1" required  class="required fs_input" minlength="2">
         <input type="submit" value="검색" class="fs_submit">
     </fieldset>
 
diff --git a/skin/member/kcpcert/login.skin.php b/skin/member/kcpcert/login.skin.php
index aa0c4c5d8..eee8279b4 100644
--- a/skin/member/kcpcert/login.skin.php
+++ b/skin/member/kcpcert/login.skin.php
@@ -10,9 +10,9 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 
     <fieldset class="cbg">
         <label for="login_id" class="login_id">회원아이디<strong class="sound_only">필수</strong></label>
-        <input type="text" name="mb_id" id="login_id" required class="fs_input" size="20" maxLength="20">
+        <input type="text" name="mb_id" id="login_id" required class="required fs_input" size="20" maxLength="20">
         <label for="login_pw" class="login_pw">패스워드<strong class="sound_only">필수</strong></label>
-        <input type="password" name="mb_password" id="login_pw" required class="fs_input" size="20" maxLength="20">
+        <input type="password" name="mb_password" id="login_pw" required class="required fs_input" size="20" maxLength="20">
         <input type="submit" value="로그인" class="btn_submit">
         <input type="checkbox" name="auto_login" id="login_auto_login">
         <label for="login_auto_login">자동로그인</label>
diff --git a/skin/member/kcpcert/member_confirm.skin.php b/skin/member/kcpcert/member_confirm.skin.php
index 776161e40..bb0071311 100644
--- a/skin/member/kcpcert/member_confirm.skin.php
+++ b/skin/member/kcpcert/member_confirm.skin.php
@@ -19,7 +19,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
         <span id="mb_confirm_id"><?=$member[mb_id]?></span>
 
         <label for="confirm_mb_password">패스워드<strong class="sound_only">필수</strong></label>
-        <input type="password" name="mb_password" id="confirm_mb_password" required class="fs_input" size="15" maxLength="20">
+        <input type="password" name="mb_password" id="confirm_mb_password" required class="required fs_input" size="15" maxLength="20">
         <input type="submit" value="확인" id="btn_submit" class="fs_submit">
     </fieldset>
 
diff --git a/skin/member/kcpcert/register_form.skin.php b/skin/member/kcpcert/register_form.skin.php
index 14123962e..5b054b503 100644
--- a/skin/member/kcpcert/register_form.skin.php
+++ b/skin/member/kcpcert/register_form.skin.php
@@ -20,18 +20,18 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 <tr>
     <th scope="row"><label for="reg_mb_id">아이디<strong class="sound_only">필수</strong></label></th>
     <td>
-        <input type="text" name="mb_id" value="<?=$member['mb_id']?>" id="reg_mb_id" class="frm_input minlength_3 <?=$required?> <?=$readonly?>" maxlength="20" <?=$required?> <?=$readonly?>>
+        <input type="text" name="mb_id" value="<?=$member['mb_id']?>" id="reg_mb_id"<?=$required?> <?=$readonly?> class="frm_input minlength_3 <?=$required?> <?=$readonly?>" maxlength="20">
         <span id="msg_mb_id"></span>
         <span class="frm_info">영문자, 숫자, _ 만 입력 가능. 최소 3자이상 입력하세요.</span>
     </td>
 </tr>
 <tr>
     <th scope="row"><label for="reg_mb_password">패스워드<strong class="sound_only">필수</strong></label></th>
-    <td><input type="password" name="mb_password" id="reg_mb_password" class="frm_input minlength_3 <?=$required?>" maxlength="20" <?=$required?>></td>
+    <td><input type="password" name="mb_password" id="reg_mb_password" <?=$required?> class="frm_input minlength_3 <?=$required?>" maxlength="20"></td>
 </tr>
 <tr>
     <th scope="row"><label for="reg_mb_password_re">패스워드 확인<strong class="sound_only">필수</strong></label></th>
-    <td><input type="password" name="mb_password_re" id="reg_mb_password_re" class="frm_input minlength_3 <?=$required?>" maxlength="20" <?=$required?>></td>
+    <td><input type="password" name="mb_password_re" id="reg_mb_password_re" <?=$required?> class="frm_input minlength_3 <?=$required?>" maxlength="20"></td>
 </tr>
 </table>
 
@@ -40,7 +40,7 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 <tr>
     <th scope="row"><label for="reg_mb_name">이름<strong class="sound_only">필수</strong></label></th>
     <td>
-        <input name="mb_name" value="<?=$member['mb_name']?>" id="reg_mb_name" class="frm_input hangul nospace <?=$required?> <?=$readonly?>" size="10" <?=$required?> <?=$readonly?>>
+        <input name="mb_name" value="<?=$member['mb_name']?>" id="reg_mb_name" <?=$required?> <?=$readonly?> class="frm_input hangul nospace <?=$required?> <?=$readonly?>" size="10">
         <? if ($w=='') { echo "<span class=\"frm_info\">공백없이 한글만 입력하세요.</span>"; } ?>
     </td>
 </tr>