diff --git a/adm/admin.head.php b/adm/admin.head.php
index b62be4ef3..48a0a81e7 100644
--- a/adm/admin.head.php
+++ b/adm/admin.head.php
@@ -66,7 +66,7 @@ function imageview(id, w, h)
 
         <div id="logo"><a href="<?=G4_ADMIN_URL?>"><img src="<?=G4_ADMIN_URL?>/img/logo.jpg" alt="<?=$config['cf_title']?> 관리자 처음으로"></a></div>
 
-        <div id="snb">
+        <div id="mb_nb">
             <ul>
                 <li>
                     <a href="<?=G4_ADMIN_URL?>/member_form.php?w=u&amp;mb_id=<?=$member['mb_id']?>">
diff --git a/css/admin.css b/css/admin.css
index 5ceb3a1fe..0a8de5b21 100644
--- a/css/admin.css
+++ b/css/admin.css
@@ -45,12 +45,12 @@ h2 {font-size:1.2em}
 #logo {position:relative;height:70px}
 #logo img {position:absolute;top:15px;left:0}
 
-#snb {z-index:2;position:absolute;top:16px;right:0;zoom:1}
-#snb:after {display:block;visibility:hidden;clear:both;content:""}
-#snb ul {float:right;margin:0;padding:0;zoom:1}
-#snb ul:after {display:block;visibility:hidden;clear:both;content:""}
-#snb li {float:left;margin-left:20px}
-#snb a {display:inline-block;padding:5px 0;color:#e0e0e0;font-size:0.9em;text-decoration:none}
+#mb_nb {z-index:2;position:absolute;top:16px;right:0;zoom:1}
+#mb_nb:after {display:block;visibility:hidden;clear:both;content:""}
+#mb_nb ul {float:right;margin:0;padding:0;zoom:1}
+#mb_nb ul:after {display:block;visibility:hidden;clear:both;content:""}
+#mb_nb li {float:left;margin-left:20px}
+#mb_nb a {display:inline-block;padding:5px 0;color:#e0e0e0;font-size:0.9em;text-decoration:none}
 
 /* gnb js off */
 #gnb {z-index:10;background:#383a3f}
diff --git a/css/default.css b/css/default.css
index c56e0c922..eff1ec844 100644
--- a/css/default.css
+++ b/css/default.css
@@ -51,14 +51,14 @@ a:active {color:#000;text-decoration:underline}
 #schall_stx {padding-left:5px;width:156px;height:24px;border:1px solid #aaa;border-right:0;background:#f7f7f2;line-height:1.9em !important;line-height:1.6em}
 #schall_submit {border:1px solid #aaa;border-left:0}
 
-#snb {position:absolute;top:18px;right:0;zoom:1}
-#snb:after {display:block;visibility:hidden;clear:both;content:""}
-#snb li {float:left}
-#snb a {display:block;padding:5px 10px;color:#333;letter-spacing:-0.1em}
-#snb a:focus,
-#snb a:hover,
-#snb a:active {text-decoration:none}
-#snb img {margin-right:3px}
+#mb_nb {position:absolute;top:18px;right:0;zoom:1}
+#mb_nb:after {display:block;visibility:hidden;clear:both;content:""}
+#mb_nb li {float:left}
+#mb_nb a {display:block;padding:5px 10px;color:#333;letter-spacing:-0.1em}
+#mb_nb a:focus,
+#mb_nb a:hover,
+#mb_nb a:active {text-decoration:none}
+#mb_nb img {margin-right:3px}
 
 /* gnb js off */
 #gnb {z-index:10;margin:-1px 0 0;border-bottom:1px solid #c3c7c5;background:#f0f4f8}
@@ -95,7 +95,7 @@ a:active {color:#000;text-decoration:underline}
 #wrapper:after {display:block;visibility:hidden;clear:both;content:""}
 #wrapper_title {margin-bottom:20px;font-size:1.2em}
 
-#lnb {float:right;width:209px;border:1px solid #cfded8;background:#fff}
+#side_nb {float:right;width:209px;border:1px solid #cfded8;background:#fff}
 
 #container {z-index:4;position:relative;float:left;padding:25px 15px 15px;width:728px;min-height:500px;height:auto !important;height:500px;border:1px solid #cfded8;background:#fff;zoom:1}
 #container:after {display:block;visibility:hidden;clear:both;content:""}
diff --git a/css/mobile.css b/css/mobile.css
index 4976ec18f..dd3d1067b 100644
--- a/css/mobile.css
+++ b/css/mobile.css
@@ -45,19 +45,11 @@ pre {overflow-x:scroll;font-size:1.1em}
 #schall_stx {padding-left:0.3em;width:100px;height:1.5em;border:1px solid #aaa;border-right:0;background:#f7f7f7;line-height:1.5em;-webkit-appearance:none}
 #schall_submit {border:1px solid #aaa;border-left:0}
 
-#snb {clear:both;border-top:1px solid #e7f1ed;background:#151515;text-align:center}
-#snb li {display:inline-block;border-right:1px solid #333}
-#snb li:nth-last-of-type(1) {border-right:0 !important}
-#snb a {display:inline-block;padding:0.5em;color:#fff;text-decoration:none}
-#snb img {display:none}
-
-#gnb {border-bottom:1px solid #c3c7c5;background:#f0f4f8;zoom:1}
-#gnb:after {display:block;visibility:hidden;clear:both;content:""}
-#gnb h2 {display:none}
-#gnb_ul {border-top:1px solid #e7f1ed}
-#gnb li {float:left;width:25%;border-bottom:1px solid #e7f1ed}
-#gnb li ul {display:none}
-.gnb_1depth a {display:block;padding:1em 0;border-right:1px solid #e7f1ed;color:#000;text-align:center;text-decoration:none}
+#mb_nb {clear:both;border-top:1px solid #e7f1ed;background:#151515;text-align:center}
+#mb_nb li {display:inline-block;border-right:1px solid #333}
+#mb_nb li:nth-last-of-type(1) {border-right:0 !important}
+#mb_nb a {display:inline-block;padding:0.5em;color:#fff;text-decoration:none}
+#mb_nb img {display:none}
 
 /* 배포시에는 필요없는 부분 */
 #sirgle_title {padding:0 1em;height:100px;color:#fff;font-size:2em}
@@ -75,6 +67,14 @@ pre {overflow-x:scroll;font-size:1.1em}
 #text_size {margin:0 0 1em;text-align:center}
 
 /* 하단 레이아웃 */
+#gnb {border-top:1px solid #c3c7c5;border-bottom:1px solid #c3c7c5;background:#f0f4f8;zoom:1}
+#gnb:after {display:block;visibility:hidden;clear:both;content:""}
+#gnb h2 {width:0;height:0;font-size:0;line-height:0;overflow:hidden}
+#gnb ul {border-top:1px solid #e7f1ed}
+#gnb li {float:left;width:25%;border-bottom:1px solid #e7f1ed}
+#gnb li ul {display:none}
+#gnb li a {display:block;padding:1em 0;border-right:1px solid #e7f1ed;color:#000;text-align:center;text-decoration:none}
+
 #ft {background:#484848}
 #ft h1 {width:0;height:0;font-size:0;line-height:0;overflow:hidden}
 
diff --git a/head.php b/head.php
index cef7d3bcd..962e9e256 100644
--- a/head.php
+++ b/head.php
@@ -71,7 +71,7 @@ if ($config['cf_include_head']) {
             </script>
         </fieldset>
 
-        <ul id="snb">
+        <ul id="mb_nb">
             <li>
                 <a href="<?=G4_BBS_URL?>/current_connect.php" id="snb_cnt">
                     <img src="<?=G4_IMG_URL?>/snb_cnt.jpg" alt="">
@@ -154,7 +154,7 @@ if ($config['cf_include_head']) {
 <hr>
 
 <div id="wrapper">
-    <div id="lnb">
+    <div id="side_nb">
         <?=(G4_IS_MOBILE?outlogin('basic'):outlogin('basic')); // 외부 로그인 ?>
         <?=(G4_IS_MOBILE?poll('basic'):poll('basic')); // 설문조사 ?>
     </div>
diff --git a/mobile/head.php b/mobile/head.php
index b9a0edd8f..af830368e 100644
--- a/mobile/head.php
+++ b/mobile/head.php
@@ -58,7 +58,7 @@ include_once(G4_LIB_PATH.'/popular.lib.php');
             </script>
         </fieldset>
 
-        <ul id="snb">
+        <ul id="mb_nb">
             <li><a href="<?=G4_BBS_URL?>/current_connect.php" id="snb_cnt">접속자 <?=connect(); // 현재 접속자수 ?></a></li>
             <li><a href="<?=G4_BBS_URL?>/new.php" id="snb_new">새글</a></li>
             <? if ($is_member) { ?>
@@ -78,27 +78,14 @@ include_once(G4_LIB_PATH.'/popular.lib.php');
 
 <hr>
 
-<nav id="gnb">
-    <script>$('#gnb').addClass('gnb_js');</script>
-    <h2>홈페이지 메인메뉴</h2>
+<nav id="lnb">
     <ul>
         <?
-        $sql = " select * from {$g4['group_table']} where gr_show_menu order by gr_order ";
-        $result = sql_query($sql);
-        for ($gi=0; $row=sql_fetch_array($result); $gi++) { // gi 는 group index 
+        $sql2 = " select * from {$g4['board_table']} where gr_id = '{$gr_id}' order by bo_order ";
+        $result2 = sql_query($sql2);
+        for ($bi=0; $row2=sql_fetch_array($result2); $bi++) { // bi 는 board index
         ?>
-        <li class="gnb_1depth">
-            <a href="<?=G4_BBS_URL?>/group.php?gr_id=<?=$row['gr_id']?>"><?=$row['gr_subject']?></a>
-            <ul>
-                <?
-                $sql2 = " select * from {$g4['board_table']} where gr_id = '{$row['gr_id']}' order by bo_order ";
-                $result2 = sql_query($sql2);
-                for ($bi=0; $row2=sql_fetch_array($result2); $bi++) { // bi 는 board index
-                ?>
-                <li class="gnb_2depth"><a href="<?=G4_BBS_URL?>/board.php?bo_table=<?=$row2['bo_table']?>"><?=$row2['bo_subject']?></a></li>
-                <?}?>
-            </ul>
-        </li>
+        <li><a href="<?=G4_BBS_URL?>/board.php?bo_table=<?=$row2['bo_table']?>"><?=$row2['bo_subject']?></a></li>
         <?}?>
     </ul>
 </nav>
@@ -106,7 +93,7 @@ include_once(G4_LIB_PATH.'/popular.lib.php');
 <hr>
 
 <div id="wrapper">
-    <div id="lnb">
+    <div id="side_nb">
         <?=(G4_IS_MOBILE?outlogin('basic'):outlogin('basic')); // 외부 로그인 ?>
         <?=(G4_IS_MOBILE?poll('basic'):poll('basic')); // 설문조사 ?>
     </div>
diff --git a/mobile/tail.php b/mobile/tail.php
index 856996a3f..696bbaf24 100644
--- a/mobile/tail.php
+++ b/mobile/tail.php
@@ -6,6 +6,22 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 
 <hr>
 
+<nav id="gnb">
+    <script>$('#gnb').addClass('gnb_js');</script>
+    <h2>홈페이지 메인메뉴</h2>
+    <ul>
+        <?
+        $sql = " select * from {$g4['group_table']} where gr_show_menu order by gr_order ";
+        $result = sql_query($sql);
+        for ($gi=0; $row=sql_fetch_array($result); $gi++) { // gi 는 group index 
+        ?>
+        <li><a href="<?=G4_BBS_URL?>/group.php?gr_id=<?=$row['gr_id']?>"><?=$row['gr_subject']?></a></li>
+        <?}?>
+    </ul>
+</nav>
+
+<hr>
+
 <footer id="ft">
     <h1><?=$config['cf_title']?> 정보</h1>
     <?=popular('basic'); // 인기검색어 ?>