From 62cdfcfd349038219f928c1bf166871be4cc8963 Mon Sep 17 00:00:00 2001
From: "Davide P. Cervone" <dpvc@union.edu>
Date: Mon, 18 Nov 2013 20:01:54 -0500
Subject: [PATCH] Check for whether MathJax is already loaded before using
 MathJax variable for AuthorConfig.  Resolves issue #671.

---
 unpacked/MathJax.js | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/unpacked/MathJax.js b/unpacked/MathJax.js
index 409a3e843..e101e0a78 100644
--- a/unpacked/MathJax.js
+++ b/unpacked/MathJax.js
@@ -27,16 +27,26 @@
  *  limitations under the License.
  */
 
-if (window.MathJax) {window.MathJax = {AuthorConfig: window.MathJax}} else {window.MathJax = {}}
+
+//
+//  Check if browser can support MathJax (no one fails this nowadays)
+//
+if (document.getElementById && document.childNodes && document.createElement) {
+//
+//  Skip if MathJax is already loaded
+//
+if (!(window.MathJax && MathJax.Hub)) {
+  
+//
+//  Get author configuration from MathJax variable, if any
+//
+if (window.MathJax) {window.MathJax = {AuthorConfig: window.MathJax}}
+               else {window.MathJax = {}}
 
 // MathJax.isPacked = true; // This line is uncommented by the packer.
 
-if (document.getElementById && document.childNodes && document.createElement) {
-
-if (!MathJax.Hub) {  // skip if already loaded
-  
 MathJax.version = "2.3";
-MathJax.fileversion = "2.3";
+MathJax.fileversion = "2.3.1";
 
 /**********************************************************/