fix scriptloading on old ie

lib/ace/lib/net.js

@@ -1,6 +1,6 @@
 /*
  * based on code from:
- * 
+ *
  * @license RequireJS text 0.25.0 Copyright (c) 2010-2011, The Dojo Foundation All Rights Reserved.
  * Available via the MIT or new BSD license.
  * see: http://github.com/jrburke/requirejs for details
@@ -8,6 +8,8 @@
 define(function(require, exports, module) {
 "use strict";
 
+var useragent = require("ace/lib/useragent");
+
 exports.get = function (url, callback) {
     var xhr = exports.createXhr();
     xhr.open('GET', url, true);
@@ -55,8 +57,13 @@ exports.loadScript = function(path, callback) {
 
     s.src = path;
     head.appendChild(s);
-    
-    s.onload = callback;
+
+    if (useragent.isOldIE)
+        s.onreadystatechange = function () {
+            this.readyState == 'loaded' && callback();
+        };
+    else
+        s.onload = callback;
 };
 
 });