restricting movement from arrow keypad

[garrybibson]

Hi,

I am playing around making a little game from a tutorial and i am having trouble trying to limit where the "car" can travel on the screen. At present it has a free range and will disappear out of view if asked to. Can anyone make a suggestion what code i need to add? I have been searching and trying for two hours but just cant get it to work.

This is what i have at present

code:

---

listener = new Object();

listener.onKeyDown = function () {

	delete car.onEnterFrame;

	var yval = 0; 

	var xval = 0; 

	switch (Key.getCode()) {

	  case Key.DOWN: yval = 8; 	car.rotate(30,30); break;

	  case Key.UP: yval = -8; 	car.rotate(-30,30); break;

	  case Key.LEFT: xval = -8; car.rotate(-30,30);break;

	  case Key.RIGHT: xval = 8; car.rotate(30,30);

	}

	car.onEnterFrame = function(){

		this._y += yval; 

		this._x += xval;



	}

};

---

Basically i just want to limit the cars movement to within the track!
Any help or advice would be greatly welcomed.

Barry

EDIT: Added as tags. - jbum