How do I get a function to recognize a variable in function Update()

 //SCRIPT GOAL
 //every 10 seconds pick a location,move to it and then patrol
 
 var ready : boolean;
 var speed : float;
 var timer : float;
 var patrolTimer : float = 10; //how long should it patrol for
 
 
 //Targets
 var target1 : Transform;
 var target2 : Transform;
 var target3 : Transform;
 var target4 : Transform;
 
 
 
 function Update (){
 
 if(ready == true){
 patrolTimer = 10;
 //pick location
 var chooseNext = Random.Range(0,2);
 //countdown to move 
 timer -= Time.deltaTime;
     if(timer <= 0){
     ready = false;
     }
 }
 
 if(ready == false){
 Move();
 }
 
 }
 
 
 function Move(){
 
 var step = speed * Time.deltaTime;
 
 if(chooseNext == 0){
 Debug.Log("moving");
 
 // move towards target1
         transform.position = Vector3.MoveTowards(transform.position, target1.position, step);
         if(this.gameObject.transform.position == target1.position){
         Patrol();
         Debug.Log("Reached destination 1");
         }
 }
         
         
         if(chooseNext == 1){
 Debug.Log("moving");
 
 // move towards target1
         transform.position = Vector3.MoveTowards(transform.position, target2.position, step);
         if(this.gameObject.transform.position == target2.position){
         Patrol();
         Debug.Log("Reached destination 2");
         }
         }
         
         if(chooseNext == 2){
 Debug.Log("moving");
 
 // move towards target1
         transform.position = Vector3.MoveTowards(transform.position, target3.position, step);
         if(this.gameObject.transform.position == target3.position){
         Patrol();
         Debug.Log("Reached destination 3 ");
         }
         
 }
 }
 
 
 
 function Patrol(){
 //patrolling
 Debug.Log("patrolling");
 patrolTimer -= Time.deltaTime;
 
   if(patrolTimer <=0){
   //finished patrolling
              ready = true;
              Timer = 1;
              Debug.Log("Ready to move");
              
            }
 }

Debugger keeps giving unknown identifier : chooseNext. I want chooseNext to change everytime ready becomes true so I can't put it into move() otherwise the ready = false function would keep calling it andd the object would spaz out deciding where to go. How can I get the function Move() section to get the chooseNext variable from update().

Thanks in advance Stealth