/*--------------------------------------------------*/
/* Original Example */

Obj = {
  myalert: function(){
    alert("bam!");
  },
  callbackFn: function(){
    this.myalert();
  },
  firstFn: function(callback, callbackObj){
    callback.apply(callbackObj);
  },
  secondFn: function(){
    this.firstFn(this.callbackFn, this);
  }
}
Obj.secondFn();

/* Example using closure to store function context */
Obj = {
  myalert: function(){
    alert("bam!");
  },
  callbackFn: function(){
    this.myalert();
  },
  firstFn: function(callback){
    callback();
  },
  secondFn: function(){
    var that = this;
    var closure = function() {
        that.callbackFn.apply(that, arguments);
    };

    this.firstFn(closure);
  }
}
Obj.secondFn();

/*--------------------------------------------------*/
/* Example generalizing the closure to bind a function to a context */

var bindThis = function(callback, context) {
    return function() {
        callback.apply(context, arguments);
    };
};

Obj = {
  myalert: function(){
    alert("bam!");
  },
  callbackFn: function(){
    this.myalert();
  },
  firstFn: function(callback){
    callback();
  },
  secondFn: function(){
    // using custom bind function that we wrote (see above)
    this.firstFn(bindThis(this.callbackFn, this));

    // or using jQuery's proxy function to do the same thing
    this.firstFn($.proxy(this.callbackFn, this));

    // or using underscore/lodash's bind function
    this.firstFn(_.bind(this.callbackFn, this));
  }
}
Obj.secondFn();