From d33ddec47088c1d5e67a2d88325d3d9d50031439 Mon Sep 17 00:00:00 2001
From: Rocky Duan <dementrock@gmail.com>
Date: Mon, 6 Aug 2012 22:20:56 -0400
Subject: [PATCH] fixed multiple renderer bug

---
 lms/static/coffee/src/mathjax_delay_renderer.coffee | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lms/static/coffee/src/mathjax_delay_renderer.coffee b/lms/static/coffee/src/mathjax_delay_renderer.coffee
index b70cb28246..9c3f3c5f92 100644
--- a/lms/static/coffee/src/mathjax_delay_renderer.coffee
+++ b/lms/static/coffee/src/mathjax_delay_renderer.coffee
@@ -8,11 +8,14 @@ class @MathJaxDelayRenderer
   elapsedTime: 0
   mathjaxDelay: 0
   mathjaxTimeout: undefined
-  bufferId: "mathjax_delay_buffer"
+  bufferId = "mathjax_delay_buffer"
+  numBuffers = 0
 
   constructor: (params) ->
     params = params || {}
     @maxDelay = params["maxDelay"] || @maxDelay
+    @bufferId = params["bufferId"] || (bufferId + numBuffers)
+    numBuffers += 1
     @$buffer = $("<div>").attr("id", @bufferId).css("display", "none").appendTo($("body"))
 
   # render: (params) ->