How do i write a script that switches between 2 variables.

How do i write a script that when triggered switches out "camera1" for "camera2" in the "n = camera1.transform.position - transform.position;" variable?.

I have tried severals ways but I'm new to unity and scripting in it so my tries were probably wrong. If someone could give me an example of how i could write it, I would massively thankful.

this is the Code

 var go = GameObject.Find("camera1");
 var camera1 : Transform;
 var camera2 : Transform;
 
 
 
 function start()
 { 
 }
 
 
 
 function Update() 
 {
 
 var n = camera1.transform.position - transform.position;
 transform.rotation = Quaternion.LookRotation( n );
 
 if (go.GetComponent(GUI_cam).count == 2)
     {
     //CAMERA 1 GOES HERE
     }
 
 if (go.GetComponent(GUI_cam).count == 3)
     {
     //CAMERA 2 GOES HERE
     }
 
 
 }