diff --git a/app/views/courses/_join_private_course.html.erb b/app/views/courses/_join_private_course.html.erb
index 788f47d2d..934a4eb33 100644
--- a/app/views/courses/_join_private_course.html.erb
+++ b/app/views/courses/_join_private_course.html.erb
@@ -32,7 +32,6 @@
   <script type="text/javascript">
       function submit_form(obj)
       {
-          hideModal(obj);
           $("#new-watcher-form").submit();
       }
 
diff --git a/app/views/courses/_set_join.js.erb b/app/views/courses/_set_join.js.erb
index 0ccefdba1..d1828bbdb 100644
--- a/app/views/courses/_set_join.js.erb
+++ b/app/views/courses/_set_join.js.erb
@@ -4,7 +4,7 @@
 <% if @state %>
 	<% if @state == 0 %>
 		alert("加入成功");
-        hideModal("#popbox02");
+            hideModal($("#popbox"));
 	<% elsif @state == 1 %>
 		alert("密码错误");
 	<% elsif @state == 2 %>