What's wrong with my script?

OK, I'm just a beginner, so don't expect me to know much about JavaScript. I'm trying to get this script to work, the movement already works, but the addForce part doesn't. I can play without errors but whenever I press spacebar, my character doesn't jump. I'm trying to do a bird-themed game, so whenever I add force to th object, it doesn't need to be on the ground. Thanks!

 var speed = 7.0; var rotateSpeed = 3.0;
 var flap;
 
 function Update ()
  {
     var controller : CharacterController = GetComponent(CharacterController);transform.Rotate(0, Input.GetAxis ("Horizontal") * rotateSpeed, 0);
     var forward = transform.TransformDirection(Vector3.forward);
     var curSpeed = speed * Input.GetAxis ("Vertical"); controller.SimpleMove(forward * curSpeed);
 
     flap = (Input.GetButtonDown("Jump"));
     rigidbody.AddForce (Vector3.up * 200);
 
        
       
       
 } ;