How do you write scripts attached to a game object that move the main camera

I have a game object that I am successfully tweening with javascript and iTween. I want to have this script create a reference to the scene's Main Camera, and tween that camera. How do I do this? Here's my code so far (which doesn't work).

 var igniter : GameObject;
 var camera : GameObject;
 
 function Start () {
     lighterUp();
 }
 
 function lighterUp(){
     iTween.MoveTo(gameObject,{"y":-2.75,"time":3,"easeType": "easeInOutQuad","oncomplete":"lighterTurn"});
     
 }
 
 function lighterTurn(){
     iTween.RotateTo(gameObject,{"y":0,"oncomplete":"lighterTurnIgniter"});
 }
 
 function lighterTurnIgniter(){
     iTween.RotateTo(igniter,{"x":180});
     iTween.MoveTo(camera,{"z":-50}); //Doesn't Work
 }