Add check to only init and run JS code once - even if included multiple times.

framework/assets/js/notification.js

@@ -6,11 +6,14 @@
  * Copyright (c) 2010, IBM Corporation
  */
 
+if (!PhoneGap.hasResource("notification")) {
+PhoneGap.addResource("notification");
+
 /**
  * This class provides access to notifications on the device.
  */
-function Notification() {
-}
+Notification = function() {
+};
 
 /**
  * Open a native alert dialog, with a customizable title and button text.
@@ -115,4 +118,4 @@ PhoneGap.addConstructor(function() {
         navigator.notification = new Notification();
     }
 });
-
+};