call different method for two checkbox list

I have two checkbox lists and when any checkbox from any two list is checked i call the method through this event

 $("input[type='checkbox']").change(function () {
            var val = $(this).val();
            if (this.checked) // if changed state is "CHECKED"
            {
                MainClass.onLayer(val);

                // do the magic here
            } else {
                if (val != undefined) {
                    MainClass.offLayer(val);
                }
    //            alert("false");
            }
        });
    });

So now the problem is need to call separate methods for the two checkbox lists?How can i do that?