add 403 error

controller/admin.php

@@ -104,7 +104,9 @@ function check_auth($user,$password){
     $cookie = $_COOKIE['key'];
     //如果cookie的值和计算的key不一致，则没有权限
     if( $cookie != $key ){
-        exit("<h3>认证失败，请<a href = 'index.php?c=login'>重新登录</a>！</h3>");
+        $msg = "<h3>认证失败，请<a href = 'index.php?c=login'>重新登录</a>！</h3>";
+        require('templates/admin/403.php');
+        exit;
     }
 }