Entering/exiting vehicles

Hello i have been trying to use a system for entering and exiting vehicles. I used one from another posthttp://answers.unity3d.com/questions/51051/vehicle-enterexit-system-for-first3rd-person-.html followed everything and still didn't work This is the code i use i attached it to the door trigger i created a exit point i changed the tags i made a vehicle tag. When i play it say's something is up with the input but i am not sure what to call the button. Thanks any help is really appreciated

 var car : Transform;
 var player : Transform;
 var exitPoint : Transform;
 var doorTriggerLeft : Transform;
 var PlayerCamera : Camera;
 var CarCamera : Camera;
 var isPlayerVisible : boolean;
 
 
 function Update(){
     if (Input.GetButtonUp("e")&& isPlayerVisible){
         // make player invisible and still standing
         player.gameObject.SetActiveRecursively(false);
         player.gameObject.active = false;
         // parent player to Exit Point
         player.parent = exitPoint.transform;
         player.transform.localPosition = Vector3(-1.5,0,0);
         // parent PlayerParent to car
         exitPoint.parent = car.transform;
         exitPoint.transform.localPosition = Vector3(-0.5,0,0);
         // Enable Car as controllabe object
         GameObject.Find("airplane").GetComponent("moveairplane").enabled=true;
         PlayerCamera.enabled = false;
         CarCamera.enabled = true;
         }
         else
         {
     if (Input.GetKeyUp("r")){
         // make character visible again
         player.gameObject.SetActiveRecursively(true);
         player.gameObject.active = true;
         // unparent player from everything
         player.transform.parent = null;
         // parent Exit Point to door Trigger
         exitPoint.parent = doorTriggerLeft.transform;
         // disable car as controllable
         GameObject.Find("airplane").GetComponent("moveairplane").enabled=false;
         PlayerCamera.enabled = true;
         CarCamera.enabled = false;
 
         }   
     }
 }
 
 function OnTriggerEnter(Player : Collider) {
     isPlayerVisible = true;
     }
 
 function OnTriggerExit(Player : Collider) {
     isPlayerVisible  = false;
     }