Simple Javascript Event Engine.

events.js

; (function (window, undefined) {

  window.events = function (name) {
    if (typeof name !== 'string')
      return undefined;

    name = name.toLowerCase();

    if (!(window.events.collection[name] instanceof window.events.event))
      window.events.collection[name] = new window.events.event(name);

    return window.events.collection[name];
  }

  window.events.collection = [];

  window.events.event = function (name) {

    var _ctrl = this;

    _ctrl.name = name;
    _ctrl.subscribers = [];

    _ctrl.subscribe = function (func) {
      if (typeof func !== 'function')
        return null;

      var key = (function () {
        var S4 = function () {
          return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
        };
        return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4());
      })();

      this.subscribers[key] = func;

      return key;
    }

    _ctrl.raise = function (sender, args) {
      for (index in _ctrl.subscribers) {
        if (typeof (_ctrl.subscribers[index]) === 'function') {
          if (args instanceof Array) {
            _ctrl.subscribers[index].apply(sender, args);
          } else {
            _ctrl.subscribers[index].call(sender, args);
          }
        }
      }
    };

    _ctrl.unsubscribe = function (key) {
      delete _ctrl.subscribers[key];
    }

    _ctrl.dispose = function () {
      delete window.events.collection[_ctrl.name]
    }
  }

})(window);