First Person Character Controller; no head movement.

I love how this one works. It's a first person character controller, that jumps. However, it has support for footsteps, and running, (though I haven't put in the footsteps when running yet, but I will be). I'm using this for a game I'm working on, and it works great. Here is the character controller script, ready to be implemented.

var speed : float = 1;

var rotSpeed : float = 1;

var jumpStrength : float = 5;

var isGrounded : boolean;

var horizontal : float;

var vertical : float;

var leftFoot : AudioClip;

var left : boolean;

var right : boolean;

var rightFoot : AudioClip;

var steps : float;

function Start () {

}

function Update () {

horizontal = Input.GetAxis("Horizontal");

vertical = Input.GetAxis("Vertical");

if (Input.GetAxis("Horizontal"))

transform.Rotate(Vector3(0, horizontal * rotSpeed, 0));

if (isGrounded)

{

if (Input.GetAxis("Vertical"))

{

rigidbody.AddRelativeForce(Vector3(0, 0, vertical * speed), ForceMode.VelocityChange);

steps += Time.deltaTime;

if (steps >= .5 && steps < .8 && !left)

{

audio.PlayOneShot(leftFoot);

left = true;

right = false;

}

if (steps >=1 && steps < 1.3 && !right)

{

audio.PlayOneShot(rightFoot);

steps = 0;

right = true;

left = false;

}

if (steps >1.016)

steps = 0;

}

if (Input.GetButtonDown("Jump"))

rigidbody.AddRelativeForce(Vector3(0, 1 * jumpStrength,0), ForceMode.Impulse);

if (Input.GetAxis("Vertical") && Input.GetKey(KeyCode.LeftShift))

rigidbody.AddRelativeForce(Vector3(0, 0, vertical * speed*1.5), ForceMode.VelocityChange);

if (vertical == 0)

{

steps = 0;

left = false;

right = false;

}

}

if (!isGrounded)

{

if (Input.GetAxis("Vertical"))

rigidbody.AddRelativeForce(Vector3(0, 0, vertical * speed/3), ForceMode.VelocityChange);

}

}

function OnCollisionEnter (Col : Collision) {

if (Col.gameObject.tag == "Floor")

isGrounded = true;

}

function OnCollisionExit (Col : Collision) {

if (Col.gameObject.tag == "Floor")

isGrounded = false;

}