diff --git a/12/index.html b/12/index.html
index 5ef0d41..bbbc945 100644
--- a/12/index.html
+++ b/12/index.html
@@ -409,7 +409,14 @@ $(document).ready(function(){
   $("#comment_btn").click(function(){
     $("#etherpad_06").toggle();
   });
-});    
+});  
+    
+$(document).ready(function(){
+  $("#chat_btn").click(function(){
+    $("#chatwindow").toggle();
+  });
+}); 
+    
             
   </script>
 </body>