problems with switch guns need help

I need help with my gun swith statement (Look to the bottome of page): #pragma strict

var EmptyInScene : GameObject; var weapons : GameObject[] = new GameObject[4]; // Array of Weapons private var curWeapon : GameObject;

function Start () {

}

function Update () {

 if (Input.GetKeyDown("1")) ChangeWeapon(0);
 if (Input.GetKeyDown("2")) ChangeWeapon(1);
 if (Input.GetKeyDown("3")) ChangeWeapon(2);
 if (Input.GetKeyDown("4")) ChangeWeapon(3);
  

}

function ChangeWeapon(weapon:int){

  if(curWeapon){
     Destroy(curWeapon);
 }
  
 var NewObject : GameObject = Instantiate(weapons[weapon], transform.position, transform.rotation);
   NewObject.transform.parent = EmptyInScene.transform;
 

}

This works well but when I switch guns it doesn't destroy the current gun. I don't have any current gun coding. Should I make some or is there an easier way?