A callback on a Msgbox

Can I was additional parameters to a Msgbox callback list this:

var c = arr.length;
NSB.MsgBox(InsertTasksYesCallback(arr),'Are you ready to add ' + c + ' tasks?', NSB.vbYesNo,'Add Tasks');

function InsertTasksYesCallback(result, arr){
  if (result == NSB.Yes) {

You can add a reference to a callback function, but not with a parameter.

What do you mean by reference? Is that similar to ByRef?

Nope. Just the name of a function. (no arguments)