js variable scope and outer reference question!?

gistfile1.js

define([], function() {

  var _connection;
  var _fsm;

  var initialize = function(connection, fsm){
    _connection = connection;
    _fsm = fsm;

    $(document).on('keydown', function(event){
      var update = {
        type: 'update',
        action: '',
        id: _connection.getPlayerId()
      }

      if(event.keyCode >= 37 && event.keyCode <= 40 ){
        if ( event.keyCode == 37 ) {
          update.action = "left";
        } else if(event.keyCode == 38 ){
          update.action = "up";
        }else if(event.keyCode == 39 ){
          update.action = "right";
        }else if(event.keyCode == 40 ){
          update.action = "down";
        }
        _connection.sendMessage(update);
        event.preventDefault();
      }
    });
  }

  $('#playBtn').click(function(e) {
    e.preventDefault();
    _fsm.getFSM().play();  
  });
  $('#finishBtn').click(function(e) {
    e.preventDefault();
    _fsm.getFSM().finish();  
  });
  $('#waitBtn').click(function(e) {
    e.preventDefault();
    _fsm.getFSM().wait();
  });

  return {
    initialize: initialize
  }
});