Only activate scripts when game is toggled to the first person controller

How are you making the change from First to Third person views?

This is the script for toggling between views:

 var cam01 : GameObject; // first person camera
     var cam02 : GameObject; // third person camera
     var player01 : GameObject; //first person controller
     var player02 : GameObject; //third person controller
     var check;                 // New check-variable
  
     //start with first person active
     function Start() {
        cam01.gameObject.active = true; 
        cam02.gameObject.active = false; 
        player02.GetComponent(CharacterController).active = false;
        check = true;
     }
  
  
     function Update() {
     
     player01.transform.position = player02.transform.position;
  
      if (Input.Get$$anonymous$$eyDown ("return")) {
        if(check) {
          cam01.gameObject.active = false; 
          cam02.gameObject.active = true; 
          player01.GetComponent(CharacterController).active = false;
          player02.GetComponent(CharacterController).active = true;
        }
        else {
          cam01.gameObject.active = true; 
          cam02.gameObject.active = false; 
          player01.GetComponent(CharacterController).active = true;
          player02.GetComponent(CharacterController).active = false;
        }
     check = !check;
     }
     
     
   }

I tried to activate and deactivate the script on the cube this way, but it's not working.

 var firstPerson : GameObject;
 var thirdPerson : GameObject;
 
 
 
 function OnMouseOver () {
 
 if (firstPerson.active == true); {
 
  rigidbody.velocity = transform.up * 05;
 
 yield WaitForSeconds (5);
 
 rigidbody.velocity = transform.up * 0;
 }
 
 else { (firstPerson.active == false);
 
 rigidbody.velocity = transform.up * 0;
 
 }
 }

Thanks!