diff --git a/js/lib/require.js b/js/lib/require.js
index 52c2b076..56bfc198 100644
--- a/js/lib/require.js
+++ b/js/lib/require.js
@@ -1,5 +1,5 @@
 /** vim: et:ts=4:sw=4:sts=4
- * @license RequireJS 2.1.8 Copyright (c) 2010-2012, The Dojo Foundation All Rights Reserved.
+ * @license RequireJS 2.1.9 Copyright (c) 2010-2012, The Dojo Foundation All Rights Reserved.
  * Available via the MIT or new BSD license.
  * see: http://github.com/jrburke/requirejs for details
  */
@@ -12,7 +12,7 @@ var requirejs, require, define;
 (function (global) {
     var req, s, head, baseElement, dataMain, src,
         interactiveScript, currentlyAddingScript, mainScript, subPath,
-        version = '2.1.8',
+        version = '2.1.9',
         commentRegExp = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg,
         cjsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g,
         jsSuffixRegExp = /\.js$/,
@@ -22,7 +22,7 @@ var requirejs, require, define;
         hasOwn = op.hasOwnProperty,
         ap = Array.prototype,
         apsp = ap.splice,
-        isBrowser = !!(typeof window !== 'undefined' && navigator && window.document),
+        isBrowser = !!(typeof window !== 'undefined' && typeof navigator !== 'undefined' && window.document),
         isWebWorker = !isBrowser && typeof importScripts !== 'undefined',
         //PS3 indicates loaded and complete, but need to wait for complete
         //specifically. Sequence is 'loading', 'loaded', execution,
@@ -373,7 +373,6 @@ var requirejs, require, define;
         function hasPathFallback(id) {
             var pathConfig = getOwn(config.paths, id);
             if (pathConfig && isArray(pathConfig) && pathConfig.length > 1) {
-                removeScript(id);
                 //Pop off the first array value, since it failed, and
                 //retry
                 pathConfig.shift();
@@ -1464,6 +1463,8 @@ var requirejs, require, define;
                         var map = makeModuleMap(id, relMap, true),
                             mod = getOwn(registry, id);
 
+                        removeScript(id);
+
                         delete defined[id];
                         delete urlFetched[map.url];
                         delete undefEvents[id];
@@ -1609,7 +1610,7 @@ var requirejs, require, define;
 
                     //Join the path parts together, then figure out if baseUrl is needed.
                     url = syms.join('/');
-                    url += (ext || (/\?/.test(url) || skipExt ? '' : '.js'));
+                    url += (ext || (/^data\:|\?/.test(url) || skipExt ? '' : '.js'));
                     url = (url.charAt(0) === '/' || url.match(/^[\w\+\.\-]+:/) ? '' : config.baseUrl) + url;
                 }
 
@@ -1918,7 +1919,7 @@ var requirejs, require, define;
     }
 
     //Look for a data-main script attribute, which could also adjust the baseUrl.
-    if (isBrowser) {
+    if (isBrowser && !cfg.skipDataMain) {
         //Figure out baseUrl. Get it from the script tag with require.js in it.
         eachReverse(scripts(), function (script) {
             //Set the 'head' where we can append children by
@@ -2050,4 +2051,4 @@ var requirejs, require, define;
 
     //Set up with config info.
     req(cfg);
-}(this));
+}(this));
\ No newline at end of file