Index: index.php
===================================================================
--- \mod\chat\gui_ajax\index.php	(revision 70)
+++ \mod\chat\gui_ajax\index.php	(working copy)
@@ -58,7 +58,7 @@
     'theme'=>$theme,
     'userid'=>$USER->id,
     'sid'=>$chat_sid,
-    'timer'=>3000,
+    'timer'=>($CFG->chat_refresh_room * 1000),
     'chat_lasttime'=>0,
     'chat_lastrow'=>null,
     'chatroom_name'=>format_string($course->shortname) . ": ".format_string($chat->name,true).$groupname