/Scripts/MasterController.js

var firstCharacter : GameObject;
var secondCharacter : GameObject;
var thirdCharacter : GameObject;

private var activePlayer : int;

function Start () {
	activePlayer = 0;
	firstCharacter.GetComponent(ModifiedController).enable = true;
}

function Update () {
	if(Input.GetButtonDown("Fire3")){
		switch (activePlayer){
			case 0:
				activePlayer = 1;
				firstCharacter.GetComponent(ModifiedController).enable = false;
				secondCharacter.GetComponent(ModifiedController).enable = true;
				thirdCharacter.GetComponent(ModifiedController).enable = false;
				break;
			case 1:
				activePlayer = 2;
				firstCharacter.GetComponent(ModifiedController).enable = false;
				secondCharacter.GetComponent(ModifiedController).enable = false;
				thirdCharacter.GetComponent(ModifiedController).enable = true;
				break;
			case 2:
				activePlayer = 0;
				firstCharacter.GetComponent(ModifiedController).enable = true;
				secondCharacter.GetComponent(ModifiedController).enable = false;
				thirdCharacter.GetComponent(ModifiedController).enable = false;
				break;
		}
	}
}