diff --git a/bbs/alert.php b/bbs/alert.php
index 2ec19e92e..83d8bf919 100644
--- a/bbs/alert.php
+++ b/bbs/alert.php
@@ -41,7 +41,8 @@ if($error) {
 
 <script>
 alert("<? echo $msg; ?>");
-document.location.href = "<? echo $url; ?>";
+//document.location.href = "<? echo $url; ?>";
+document.location.replace("<? echo $url; ?>");
 </script>
 
 <noscript>
diff --git a/bbs/login.php b/bbs/login.php
index 9471bb71c..62a989454 100644
--- a/bbs/login.php
+++ b/bbs/login.php
@@ -24,7 +24,7 @@ if ($url)
 else
     $urlencode = urlencode($_SERVER['REQUEST_URI']);
 
-if ($config['cf_https_url']) {
+if (G4_HTTPS_DOMAIN) {
     $login_url = $_GET['url'];
     if ($login_url) {
         if (preg_match("/^\.\.\//", $url)) {
@@ -35,10 +35,10 @@ if ($config['cf_https_url']) {
                 $path = urlencode($purl['path']);
                 $urlencode = preg_replace("/".$path."/", "", $urlencode);
             }
-            $login_url = $g4[url].$urlencode;
+            $login_url = $urlencode;
         }
     } else {
-        $login_url = $g4[url];
+        $login_url = G4_URL;
     }
 } else {
     $login_url = $urlencode;
diff --git a/bbs/login_check.php b/bbs/login_check.php
index a8680a96c..b1992936f 100644
--- a/bbs/login_check.php
+++ b/bbs/login_check.php
@@ -71,7 +71,7 @@ if ($url) {
         }
     }
 } else  {
-    $link = G4_PATH;
+    $link = G4_URL;
 }
 
 goto_url($link);
diff --git a/bbs/memo_form.php b/bbs/memo_form.php
index 0571f0ef2..bc6a84486 100644
--- a/bbs/memo_form.php
+++ b/bbs/memo_form.php
@@ -35,11 +35,7 @@ if ($me_recv_mb_id)
 $g4['title'] = '쪽지 보내기';
 include_once(G4_PATH.'/head.sub.php');
 
-if ($g4['https_url'])
-    $memo_action_url = "{$g4['https_url']}/{$g4['bbs']}/memo_form_update.php";
-else
-    $memo_action_url = "{$g4['url']}/{$g4['bbs']}/memo_form_update.php";
-
+$memo_action_url = G4_HTTPS_BBS_URL."/memo_form_update.php";
 include_once($member_skin_path.'/memo_form.skin.php');
 
 include_once(G4_PATH.'/tail.sub.php');
diff --git a/bbs/password_lost.php b/bbs/password_lost.php
index 19e716762..aab1d68c7 100644
--- a/bbs/password_lost.php
+++ b/bbs/password_lost.php
@@ -9,12 +9,7 @@ if ($is_member) {
 $g4['title'] = '회원아이디/패스워드 찾기';
 include_once(G4_PATH.'/head.sub.php');
 
-if ($g4['https_url'])
-    //$action_url = "{$g4['https_url']}/{$g4['bbs']}/password_lost2.php";
-    $action_url = G4_BBS_URL."/password_lost2.php";
-else
-    $action_url = G4_BBS_URL."/password_lost2.php";
-
+$action_url = G4_HTTPS_BBS_URL."/password_lost2.php";
 include_once($member_skin_path.'/password_lost.skin.php');
 
 include_once(G4_PATH.'/tail.sub.php');
diff --git a/bbs/write.php b/bbs/write.php
index 33c9fe594..a5954a0e8 100644
--- a/bbs/write.php
+++ b/bbs/write.php
@@ -349,10 +349,7 @@ if ($is_guest) {
 include_once(G4_PATH.'/head.sub.php');
 include_once('./board_head.php');
 
-if ($g4['https_url'])
-    $action_url = "{$g4['https_url']}/{$g4['bbs']}/write_update.php";
-else
-    $action_url = G4_BBS_URL."/write_update.php";
+$action_url = G4_HTTPS_BBS_URL."/write_update.php";
 
 include_once ($board_skin_path.'/write.skin.php');
 
diff --git a/bbs/write_update.php b/bbs/write_update.php
index afa51a235..288728f1d 100644
--- a/bbs/write_update.php
+++ b/bbs/write_update.php
@@ -605,13 +605,9 @@ if (!($w == 'u' || $w == 'cu') && $config['cf_email_use'] && $board['bo_use_emai
 @include_once ($board_skin_path.'/write_update.skin.php');
 
 @include_once($board_skin_path.'/write_update.tail.skin.php');
-if ($g4['https_url'])
-    $https_url = $g4['url'].'/'.$g4['bbs'];
-else
-    $https_url = '.';
 
 if ($file_upload_msg)
-    alert($file_upload_msg, $https_url.'/board.php?bo_table='.$bo_table.'&amp;wr_id='.$wr_id.'&amp;page='.$page.$qstr);
+    alert($file_upload_msg, G4_HTTPS_BBS_URL.'/board.php?bo_table='.$bo_table.'&amp;wr_id='.$wr_id.'&amp;page='.$page.$qstr);
 else
-    goto_url($https_url.'/board.php?bo_table='.$bo_table.'&amp;wr_id='.$wr_id.'&amp;page='.$page.$qstr);
+    goto_url(G4_HTTPS_BBS_URL.'/board.php?bo_table='.$bo_table.'&amp;wr_id='.$wr_id.'&amp;page='.$page.$qstr);
 ?>
diff --git a/common.php b/common.php
index a71cadfe0..1892059f7 100644
--- a/common.php
+++ b/common.php
@@ -125,8 +125,8 @@ ini_set("session.gc_maxlifetime", 10800); // session data의 garbage collection
 ini_set("session.gc_probability", 1); // session.gc_probability는 session.gc_divisor와 연계하여 gc(쓰레기 수거) 루틴의 시작 확률을 관리합니다. 기본값은 1입니다. 자세한 내용은 session.gc_divisor를 참고하십시오.
 ini_set("session.gc_divisor", 100); // session.gc_divisor는 session.gc_probability와 결합하여 각 세션 초기화 시에 gc(쓰레기 수거) 프로세스를 시작할 확률을 정의합니다. 확률은 gc_probability/gc_divisor를 사용하여 계산합니다. 즉, 1/100은 각 요청시에 GC 프로세스를 시작할 확률이 1%입니다. session.gc_divisor의 기본값은 100입니다.
 
-session_set_cookie_params(0, "/");
-ini_set("session.cookie_domain", $g4['cookie_domain']);
+session_set_cookie_params(0, '/');
+ini_set("session.cookie_domain", G4_COOKIE_DOMAIN);
 
 @session_start();
 
diff --git a/config.php b/config.php
index febacf389..51234f8b4 100644
--- a/config.php
+++ b/config.php
@@ -23,19 +23,23 @@ function g4_path()
     return $result;
 }
 
-$g4_path = g4_path();
-
 //==============================================================================
 // 상수 선언
 //------------------------------------------------------------------------------
 // 이 상수가 정의되지 않으면 각각의 개별 페이지는 별도로 실행될 수 없음
 define('_GNUBOARD_', true);
 
+$g4_path = g4_path();
+
 // URL 은 브라우저상에서의 경로 (도메인으로 부터의)
 define('G4_ADMIN_DIR',      'adm');
 define('G4_BBS_DIR',        'bbs');
 
-define('G4_URL',            $g4_path['url']);
+if (G4_DOMAIN) {
+    define('G4_URL',        G4_DOMAIN);
+} else {
+    define('G4_URL',        $g4_path['url']);
+}
 define('G4_ADMIN_URL',      G4_URL.'/'.G4_ADMIN_DIR);
 define('G4_BBS_URL',        G4_URL.'/'.G4_BBS_DIR);
 define('G4_CSS_URL',        G4_URL.'/css');
@@ -61,6 +65,9 @@ define('G4_CKEDITOR_PATH',  G4_BBS_PATH.'/ckeditor');
 define('G4_CACHE_PATH',     G4_DATA_PATH.'/cache');
 define('G4_EDITOR_PATH',    G4_DATA_PATH.'/editor');
 
+unset($g4_path);
+
+
 // 입력값 검사 상수 (숫자를 변경하시면 안됩니다.)
 define('G4_ALPHAUPPER',   1); // 영대문자
 define('G4_ALPHALOWER',   2); // 영소문자
@@ -121,31 +128,8 @@ $g4['token_table']         = $g4['table_prefix'] . 'token';         // 토큰 
 // 기타
 //
 
-// www.sir.co.kr 과 sir.co.kr 도메인은 서로 다른 도메인으로 인식합니다. 쿠키를 공유하려면 .sir.co.kr 과 같이 입력하세요.
-// 이곳에 입력이 없다면 www 붙은 도메인과 그렇지 않은 도메인은 쿠키를 공유하지 않으므로 로그인이 풀릴 수 있습니다.
-$g4['cookie_domain'] = '';
-define('G4_COOKIE_DOMAIN', '');
-
 // 게시판에서 링크의 기본갯수를 말합니다.
 // 필드를 추가하면 이 숫자를 필드수에 맞게 늘려주십시오.
 //$g4['link_count'] = 2;
 define('G4_LINK_COUNT', 2);
-
-//$g4['charset'] = 'utf-8';
-
-//$g4['token_time'] = 3; // 토큰 유효시간
-
-// config.php 가 있는곳의 웹경로. 뒤에 / 를 붙이지 마세요.
-// 예) http://g4.sir.co.kr
-//$g4['url'] = '';
-$g4['https_url'] = '';
-// 입력예
-//$g4['url'] = "http://www.sir.co.kr";
-//$g4['https_url'] = "https://www.sir.co.kr";
-
-//$g4['dbconfig'] = 'data/dbconfig.php';
-
-//$g4['js_file']        = array();
-
-unset($g4_path);
 ?>
diff --git a/extend/g4s.extend.php b/extend/g4s.extend.php
deleted file mode 100644
index 6fdf3988d..000000000
--- a/extend/g4s.extend.php
+++ /dev/null
@@ -1,66 +0,0 @@
-<?
-if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
-
-//===================================================================================
-// g4s 디렉토리 경로
-//-----------------------------------------------------------------------------------
-
-$g4['https_bbs_url']  = $g4['bbs_url'];
-if ($g4['https_url']) {
-    $g4['https_bbs_url'] = $g4['https_url'].'/'.$g4['bbs'];
-}
-
-$g4['extend_dir']   = 'extend';
-$g4['extend_path']  = $g4['path'].'/'.$g4['extend_dir'];
-
-$g4['data_dir']     = 'data';
-$g4['data_url']     = $g4['url'].'/'.$g4['data_dir'];
-$g4['data_path']    = $g4['path'].'/'.$g4['data_dir'];
-
-$g4['cache_dir']    = 'cache';
-$g4['cache_path']   = $g4['data_path'].'/'.$g4['cache_dir'];
-
-$g4['session_dir']    = 'session';
-$g4['session_path']   = $g4['data_path'].'/'.$g4['session_dir'];
-
-$g4['cache_latest_dir']     = $g4['cache_dir'].'/latest';
-$g4['cache_member_dir']     = $g4['cache_dir'].'/member';
-$g4['cache_captcha_dir']    = $g4['cache_dir'].'/captcha';
-
-$g4['cache_latest_path']    = $g4['data_path'].'/'.$g4['cache_latest_dir'];
-$g4['cache_member_path']    = $g4['data_path'].'/'.$g4['cache_member_dir'];
-$g4['cache_captcha_path']   = $g4['data_path'].'/'.$g4['cache_captcha_dir'];
-
-// g4s 기본 DHTML EDITOR
-if (!defined('G4_EDITOR')) define('G4_EDITOR', 0);
-if (G4_EDITOR) {
-    $g4['ckeditor_dir']  = 'ckeditor';
-    $g4['ckeditor_url']  = $g4['bbs_url'].'/'.$g4['ckeditor_dir'];
-    $g4['ckeditor_path'] = $g4['bbs_path'].'/'.$g4['ckeditor_dir'];
-    $g4['ckeditor_data_path'] = $g4['data_path'].'/editor';
-    $g4['ckeditor_data_url']  = $g4['data_url'].'/editor';
-
-    include_once($g4['ckeditor_path']."/ckeditor.lib.php");
-
-    $g4['js_code'][] = "var g4_ckeditor_path = \"{$g4['ckeditor_path']}\";";
-    $g4['js_file'][] = $g4['ckeditor_url']."/ckeditor.js";
-    $g4['js_file'][] = $g4['ckeditor_url']."/config.js";
-}
-
-// g4s 기본 CAPTCHA
-if (!defined('G4_CAPTCHA')) define('G4_CAPTCHA', 0);
-if (G4_CAPTCHA) {
-    $g4['gcaptcha_dir']   = 'gcaptcha';
-    $g4['gcaptcha_url']   = $g4['bbs_url'].'/'.$g4['gcaptcha_dir'];
-    $g4['gcaptcha_path']  = $g4['bbs_path'].'/'.$g4['gcaptcha_dir'];
-    $g4['gcaptcha_fonts'] = $g4['gcaptcha_path'].'/fonts';
-    $g4['gcaptcha_wavs']  = $g4['gcaptcha_path'].'/wavs';
-
-    include_once($g4['gcaptcha_path']."/gcaptcha.lib.php");
-
-    $g4['js_code'][] = "var g4_gcaptcha_path = \"{$g4['gcaptcha_path']}\";";
-    $g4['js_file'][] = $g4['gcaptcha_url']."/gcaptcha.js";
-
-}
-//===================================================================================
-?>
\ No newline at end of file
diff --git a/head.sub.php b/head.sub.php
index f26b0ebc5..be105ccfb 100644
--- a/head.sub.php
+++ b/head.sub.php
@@ -57,9 +57,10 @@ var g4_is_member = "<?=isset($is_member)?$is_member:'';?>";
 var g4_is_admin  = "<?=isset($is_admin)?$is_admin:'';?>";
 var g4_bo_table  = "<?=isset($bo_table)?$bo_table:'';?>";
 var g4_sca       = "<?=isset($sca)?$sca:'';?>";
-var g4_charset   = "<?=$g4['charset']?>";
-var g4_cookie_domain = "<?=$g4['cookie_domain']?>";
+var g4_cookie_domain = "<?=G4_COOKIE_DOMAIN?>";
+// 사라질 변수
 var g4_is_gecko  = navigator.userAgent.toLowerCase().indexOf("gecko") != -1;
+// 사라질 변수
 var g4_is_ie     = navigator.userAgent.toLowerCase().indexOf("msie") != -1;
 <? if ($is_admin) { echo 'var g4_admin_url = "'.G4_ADMIN_URL.'";'; } 
 ?>
diff --git a/lib/common.lib.php b/lib/common.lib.php
index 47c1a7e5b..0dedfb65b 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -112,7 +112,7 @@ function set_cookie($cookie_name, $value, $expire)
 {
     global $g4;
 
-    setcookie(md5($cookie_name), base64_encode($value), $g4['server_time'] + $expire, '/', $g4['cookie_domain']);
+    setcookie(md5($cookie_name), base64_encode($value), $g4['server_time'] + $expire, '/', G4_COOKIE_DOMAIN);
 }
 
 
diff --git a/lib/outlogin.lib.php b/lib/outlogin.lib.php
index c730d5653..b8b57d2be 100644
--- a/lib/outlogin.lib.php
+++ b/lib/outlogin.lib.php
@@ -28,7 +28,7 @@ function outlogin($skin_dir='basic')
             $is_auth = true;
     }
 
-    if ($config['cf_https_url']) {
+    if (G4_HTTPS_DOMAIN) {
         $outlogin_url = $_GET['url'];
         if ($outlogin_url) {
             if (preg_match("/^\.\.\//", $outlogin_url)) {
@@ -40,11 +40,11 @@ function outlogin($skin_dir='basic')
                     $path = urlencode($purl['path']);
                     $urlencode = preg_replace("/".$path."/", "", $urlencode);
                 }
-                $outlogin_url = $g4['url'].$urlencode;
+                $outlogin_url = G4_URL.$urlencode;
             }
         }
         else {
-            $outlogin_url = $g4['url'];
+            $outlogin_url = G4_URL;
         }
     }
     else {
diff --git a/skin/member/neo/login.skin.php b/skin/member/neo/login.skin.php
index cb6465dce..1c9ca70be 100644
--- a/skin/member/neo/login.skin.php
+++ b/skin/member/neo/login.skin.php
@@ -31,7 +31,7 @@ if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가
     </section>
 
     <div class="btn_confirm">
-        <a href="<?=$g4['url']?>/">메인으로 돌아가기</a>
+        <a href="<?=G4_URL?>/">메인으로 돌아가기</a>
     </div>
 
     </form>