diff --git a/css/default.css b/css/default.css
index c498d85bb..03c579a64 100644
--- a/css/default.css
+++ b/css/default.css
@@ -75,28 +75,30 @@ a:active {color:#000;text-decoration:underline}
 /* gnb js off */
 #gnb {z-index:10;margin:-1px 0 0;border-top:1px solid #e7f1ed;border-bottom:1px solid #c3c7c5;background:#f0f4f8}
 #gnb h2 {position:absolute;margin:0;padding:0;font-size:0;line-height:0;overflow:hidden}
-#gnb_ul {margin:0 auto;padding:0;width:980px;zoom:1}
-#gnb_ul:after {display:block;visibility:hidden;clear:both;content:""}
-.gnb_1depth {z-index:10;clear:both;zoom:1}
-.gnb_1depth:after {display:block;visibility:hidden;clear:both;content:""}
-.gnb_1depth a {display:block;float:left;width:80px;height:35px;font-weight:bold;line-height:2.95em;text-decoration:none}
-.gnb_1depth a:focus,
-.gnb_1depth a:hover {text-decoration:none}
-.gnb_1depth ul {float:left;width:auto}
-.gnb_2depth {float:left}
-.gnb_2depth a {font-weight:normal}
+#gnb_1dul {margin:0 auto;padding:0;width:980px;zoom:1}
+#gnb_1dul:after {display:block;visibility:hidden;clear:both;content:""}
+.gnb_1dli {z-index:10;clear:both;zoom:1}
+.gnb_1dli:after {display:block;visibility:hidden;clear:both;content:""}
+.gnb_1da {display:block;float:left;width:80px;height:35px;font-weight:bold;line-height:2.95em;text-decoration:none}
+.gnb_1da:focus,
+.gnb_1da:hover {text-decoration:none}
+.gnb_2dul {float:left;width:auto}
+.gnb_2dli {float:left}
+.gnb_2da {display:block;float:left;width:80px;height:35px;line-height:2.95em;text-decoration:none}
+.gnb_2da:focus,
+.gnb_2da:hover {text-decoration:none}
 /* gnb js on */
 .gnb_js {}
-.gnb_js #gnb_ul {zoom:1}
-.gnb_js #gnb_ul:after {display:block;visibility:hidden;clear:both;content:""}
-.gnb_js .gnb_1depth {clear:none;position:relative;float:left}
-.gnb_js .gnb_1depth a {text-align:center}
-.gnb_js .gnb_1depth_air a {float:none;background:#f7f7f2;color:#000}
-.gnb_js .gnb_1depth_on a {float:none;border-color:#e0e5e9;background:#fff;color:#000}
-.gnb_js .gnb_sub_ul {position:absolute;top:35px;width:1px;height:1px;overflow:hidden}
-.gnb_js .gnb_2depth a {display:inline-block;float:none !important;padding:0 10px;width:161px;text-align:left}
-.gnb_1depth_over .gnb_sub_ul {left:-1px;width:181px;height:auto;border:1px solid #c3c7c5;border-top:0;background:#fff}
-.gnb_1depth_over2 .gnb_sub_ul {right:-1px;width:181px;height:auto;border:1px solid #c3c7c5;border-top:0;background:#fff}
+.gnb_js #gnb_1dul {zoom:1}
+.gnb_js #gnb_1dul:after {display:block;visibility:hidden;clear:both;content:""}
+.gnb_js .gnb_1dli {clear:none;position:relative;float:left}
+.gnb_js .gnb_1da {text-align:center}
+.gnb_js .gnb_1dli_air a {float:none;background:#f7f7f2;color:#000}
+.gnb_js .gnb_1dli_on a {float:none;border-color:#e0e5e9;background:#fff;color:#000}
+.gnb_js .gnb_2dul {position:absolute;top:35px;width:1px;height:1px;overflow:hidden}
+.gnb_js .gnb_2da {display:inline-block;float:none !important;padding:0 10px;width:161px;text-align:left}
+.gnb_1dli_over .gnb_2dul {left:-1px;width:181px;height:auto;border:1px solid #c3c7c5;border-top:0;background:#fff}
+.gnb_1dli_over2 .gnb_2dul {right:-1px;width:181px;height:auto;border:1px solid #c3c7c5;border-top:0;background:#fff}
 
 .gnb_empty {width:100%;height:35px;text-align:center;line-height:2.95em}
 
diff --git a/head.php b/head.php
index ff2ad4bd8..18f66bd95 100644
--- a/head.php
+++ b/head.php
@@ -132,21 +132,21 @@ if ($config['cf_include_head']) {
 <nav id="gnb">
     <script>$('#gnb').addClass('gnb_js');</script>
     <h2>홈페이지 메인메뉴</h2>
-    <ul id="gnb_ul">
+    <ul id="gnb_1dul">
         <?php
         $sql = " select * from {$g4['group_table']} where gr_show_menu = '1' and gr_device <> 'mobile' order by gr_order ";
         $result = sql_query($sql);
         for ($gi=0; $row=sql_fetch_array($result); $gi++) { // gi 는 group index
          ?>
-        <li class="gnb_1depth">
-            <a href="<?php echo G4_BBS_URL ?>/group.php?gr_id=<?php echo $row['gr_id'] ?>"><?php echo $row['gr_subject'] ?></a>
-            <ul class="gnb_sub_ul">
+        <li class="gnb_1dli">
+            <a href="<?php echo G4_BBS_URL ?>/group.php?gr_id=<?php echo $row['gr_id'] ?>" class="gnb_1da"><?php echo $row['gr_subject'] ?></a>
+            <ul class="gnb_2dul">
                 <?php
                 $sql2 = " select * from {$g4['board_table']} where gr_id = '{$row['gr_id']}' and bo_show_menu = '1' and bo_device <> 'mobile' 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="<?php echo G4_BBS_URL ?>/board.php?bo_table=<?php echo $row2['bo_table'] ?>"><?php echo $row2['bo_subject'] ?></a></li>
+                <li class="gnb_2dli"><a href="<?php echo G4_BBS_URL ?>/board.php?bo_table=<?php echo $row2['bo_table'] ?>" class="gnb_2da"><?php echo $row2['bo_subject'] ?></a></li>
                 <?php } ?>
             </ul>
         </li>
diff --git a/js/jquery.menu.js b/js/jquery.menu.js
index 8eeea4201..f992825c5 100644
--- a/js/jquery.menu.js
+++ b/js/jquery.menu.js
@@ -15,11 +15,11 @@ $(function(){
     });
 
     // 주메뉴
-    var $gnb = $(".gnb_1depth > a");
+    var $gnb = $(".gnb_1dli > a");
     $gnb.mouseover(function() {
         if(mouse_event) {
-            $(".gnb_1depth").removeClass("gnb_1depth_over gnb_1depth_over2 gnb_1depth_on");
-            $(this).parent().addClass("gnb_1depth_over gnb_1depth_on");
+            $(".gnb_1dli").removeClass("gnb_1dli_over gnb_1dli_over2 gnb_1dli_on");
+            $(this).parent().addClass("gnb_1dli_over gnb_1dli_on");
             menu_rearrange($(this).parent());
             hide_menu = false;
         }
@@ -29,17 +29,17 @@ $(function(){
         hide_menu = true;
     });
 
-    $(".gnb_1depth li").mouseover(function() {
+    $(".gnb_2dli").mouseover(function() {
         hide_menu = false;
     });
 
-    $(".gnb_1depth li").mouseout(function() {
+    $(".gnb_2dli").mouseout(function() {
         hide_menu = true;
     });
 
     $gnb.focusin(function() {
-        $(".gnb_1depth").removeClass("gnb_1depth_over gnb_1depth_over2 gnb_1depth_on");
-        $(this).parent().addClass("gnb_1depth_over gnb_1depth_on");
+        $(".gnb_1dli").removeClass("gnb_1dli_over gnb_1dli_over2 gnb_1dli_on");
+        $(this).parent().addClass("gnb_1dli_over gnb_1dli_on");
         menu_rearrange($(this).parent());
         hide_menu = false;
     });
@@ -48,18 +48,18 @@ $(function(){
         hide_menu = true;
     });
 
-    $(".gnb_1depth ul a").focusin(function() {
-        $(".gnb_1depth").removeClass("gnb_1depth_over gnb_1depth_over2 gnb_1depth_on");
-        var $gnb_li = $(this).closest(".gnb_1depth").addClass("gnb_1depth_over gnb_1depth_on");
-        menu_rearrange($(this).closest(".gnb_1depth"));
+    $(".gnb_2da").focusin(function() {
+        $(".gnb_1dli").removeClass("gnb_1dli_over gnb_1dli_over2 gnb_1dli_on");
+        var $gnb_li = $(this).closest(".gnb_1dli").addClass("gnb_1dli_over gnb_1dli_on");
+        menu_rearrange($(this).closest(".gnb_1dli"));
         hide_menu = false;
     });
 
-    $(".gnb_1depth ul a").focusout(function() {
+    $(".gnb_2da").focusout(function() {
         hide_menu = true;
     });
 
-    $('#gnb_ul>li').bind('mouseleave',function(){
+    $('#gnb_1dul>li').bind('mouseleave',function(){
         submenu_hide();
     });
 
@@ -70,7 +70,7 @@ $(function(){
     });
 
     function submenu_hide() {
-        $(".gnb_1depth").removeClass("gnb_1depth_over gnb_1depth_over2 gnb_1depth_on");
+        $(".gnb_1dli").removeClass("gnb_1dli_over gnb_1dli_over2 gnb_1dli_on");
     }
 
     // 텍스트 리사이즈 카운트 쿠키있으면 실행
@@ -89,16 +89,16 @@ $(function(){
 
 function menu_rearrange(el)
 {
-    var width = $("#gnb_ul").width();
+    var width = $("#gnb_1dul").width();
     var left = w1 = w2 = 0;
-    var idx = $(".gnb_1depth").index(el);
+    var idx = $(".gnb_1dli").index(el);
 
     for(i=0; i<=idx; i++) {
-        w1 = $(".gnb_1depth:eq("+i+")").outerWidth();
-        w2 = $(".gnb_2depth > a:eq("+i+")").outerWidth(true);
+        w1 = $(".gnb_1dli:eq("+i+")").outerWidth();
+        w2 = $(".gnb_2dli > a:eq("+i+")").outerWidth(true);
 
         if((left + w2) > width) {
-            el.removeClass("gnb_1depth_over").addClass("gnb_1depth_over2");
+            el.removeClass("gnb_1dli_over").addClass("gnb_1dli_over2");
         }
 
         left += w1;