I am trying to make a door, when using this script nothing happens.

I applied this script to a collision box with is trigger checked, it is meant to pop up a message saying "press E to enter", when E is press it is to simply bring you to the next scene however when I make the character walk into the collision box, nothing happens, please help.

 #pragma strict
 
 var theDoor : Transform;
 private var drawGUI = false;
 var Scene : int = 0;
 
 function Update () 
 {
     if (drawGUI == true && Input.GetKeyDown(KeyCode.E))
     {
         Application.LoadLevel(Scene);
     }
 }
 
 function OnTriggerEnter (theCollider : Collider)
 {
     if (theCollider.tag == "Player")
     {
         drawGUI = true;
     }
 }
 
 function OnTriggerExit (theCollider : Collider)
 {
     if (theCollider.tag == "Player")
     {
         drawGUI = false;
     }
 }
 
 function OnGUI ()
 {
     if (drawGUI == true)
     {
         GUI.Box (Rect (Screen.width*0.5-51, 200, 102, 22), "Press E to open");
     }
 }