Drop in/ Drop out Co-op

I am trying to make it so that when you press the Start button on the Xbox Controller, it brings up a menu with various options, when you click the Co-op Mode button, it instantiates a second character and makes the camera take up half the screen, and has a second camera take up the other half. but when I click the button, it doesn't change the camera size. I can't figure it out.

 #pragma strict
 
 var Split : boolean = false;
 var TurnOnGUI : boolean = false;
 var camOne : boolean;
 var camTwo : boolean;
 
 function Start () {
 Camera.main.rect = new Rect(0,0,1,1);
 }
 
 function Update() {
    if (Input.GetButtonDown("Start_1")) {
 
 if (TurnOnGUI == false) {
    
      TurnOnGUI = true;
     
     }
     
 else if (TurnOnGUI == true) {
         TurnOnGUI = false;
 }
     }
 }
 
 function  Switch() {
  
  if (Split == false) {
   if (camOne == true) {
  Camera.main.rect = Rect(0,0,.5,1);
  Split = true;
  Debug.Log("Two Player");
  WaitForSeconds(1);
      }
          if (camTwo == true) {
      Camera.main.rect = Rect(.5,0,.5,1);
      Split = true;
      Debug.Log("Two Player");
      WaitForSeconds(1);
      }
      }
  else if (Split == true) {
   if (camOne == true) {
    Camera.main.rect = Rect(0,0,1,1);
    Split = false;
    Debug.Log("One Player");
    WaitForSeconds(1);
    }
  }
  }
 
 
 function OnGUI() {
 if (TurnOnGUI == true) {
  if (camOne == true) {
     if (GUI.Button(Rect(Screen.width * .1,Screen.height *.2,Screen.width * .3,Screen.height * .1),"Continue")) {
  
  TurnOnGUI = false;
  }
  
  if (GUI.Button(Rect(Screen.width * .1,Screen.height *.35,Screen.width * .3,Screen.height * .1),"Co-op Mode")) {
  
  Switch();
  
  TurnOnGUI = false;
  
  }
 
  GUI.Button(Rect(Screen.width * .1,Screen.height *.5,Screen.width * .3,Screen.height * .1),"Settings"); {
  
  }
 
  GUI.Button(Rect(Screen.width * .1,Screen.height *.65,Screen.width * .3,Screen.height * .1),"Credits"); {
  
  }
  
  GUI.Button(Rect(Screen.width * .1,Screen.height *.8,Screen.width * .3,Screen.height * .1),"Quit");  {
  Application.Quit();
  }
  }
  }
 
  else {
  
  }
 }