@@ -115,6 +115,10 @@
       }
     };
 
+    var isFunction = function(func) {
+      return typeof func === "function";
+    };
+
     var assign = function () {
       var to = {};
       var arg = arguments;
@@ -607,7 +611,7 @@
           var arg = arguments;
           var rv = orig.apply(this, arg);
           var event;
-          if (typeof Event == "function") {
+          if (isFunction(Event)) {
             event = new Event(type);
           } else {
             // Fix for IE