gistfile1.js

$.SubscriptionEvent = (function () {
     var subscribers = {};

     return function (id) {
            var callbacks, sub = id && subscribers[id];

            if (!sub) {
               callbacks = jQuery.Callbacks();
               sub = {
                  publish: callbacks.fire,
                  subscribe: callbacks.add,
                  unsubscribe: callbacks.remove
               };
               if (id) {
                  subscribers[id] = sub;
               }
           }
     return sub;
   };
})();