Stop animation when no more bullets

I have a script on my gun which triggers animations on button press and another script which fires rays and reloads my gun ect. But how would I alter this so that if there are no bullets left I cannot play the shoot animation until there are, can anyone help me?

animations script

 function Start () {

animation.wrapMode = WrapMode.Loop;

animation["idle"].speed = 0.2;

animation["walk"].speed = 1;

animation["reload"].speed = 2.5;

animation["shoot"].speed = 2;

animation["shoot"].wrapMode = WrapMode.Once;

animation["reload"].wrapMode = WrapMode.Once;

animation["shoot"].layer = 1;

animation["reload"].layer = 2;

animation.Stop();

}

function Update (){

if (Mathf.Abs(Input.GetAxis("Vertical")) > 0.1)

animation.CrossFade("walk");

else

animation.CrossFade("idle");

if(Input.GetButtonDown("Fire1")){

animation.Stop();

animation.Play("shoot");

}

if(Input.GetButtonDown("r")){

animation.Stop();

animation.CrossFade("reload");

}

}

raycast, reload script

 var amountOfShots = 8;

var reloadTime = 1;

function Update (){

if(Input.GetButtonDown("Fire1")){

 Shoot();

 }

 

if(Input.GetKeyDown("r")){

 Reload();

 }

}

function Reload (){

yield WaitForSeconds(reloadTime);

amountOfShots = 8;

}

var shootSound : AudioClip;

var bloodPrefab : Transform;

var sparksPrefab : Transform;

var hit : RaycastHit;

var range = 500;

function Shoot (){

     if(amountOfShots > 0){

     amountOfShots--;

     if(shootSound){

     audio.PlayOneShot(shootSound);

 }

if(Physics.Raycast(transform.position, transform.forward, hit, range)){

 var rot = Quaternion.FromToRotation(Vector3.up, hit.normal);



 if(hit.collider.tag == "Enemy"){

     if(bloodPrefab){

         Instantiate(bloodPrefab, hit.point, rot);

     }

         hit.collider.gameObject.SendMessage("ApplyDamage", 25, SendMessageOptions.DontRequireReceiver);

     }else{

     if(sparksPrefab){

         Instantiate(sparksPrefab, hit.point, rot);

         }

     }

 }

}

}