Script is not working help plz

i wrote a simple script which works on colision and showa the name of the pbject that Controller collided with but it is not working i am geeting the message of objects name on console but it is not showing on Gui plz can anyone tell me what i am doing wrong here is the code

 #pragma strict
 var Pos:Vector3;
 public var  Rname : String;
 public var  R_name : String;
 var  player :GameObject;
 var activeChild : GameObject;
 var showLOc : boolean;
 var str : String;
 
  function Start()
  {
     player = GameObject.FindWithTag("Player");
       
       activeChild = transform.gameObject;
       
       
  } 
  function OnTriggerEnter (hit : Collider) 
     {
     
 //        if(hit.gameObject.tag == "MainCamera")  
         Rname =    hit.transform.name;    
         Debug.Log("name "+Rname );
         
 
     }
 
 function OnGUI () 
 { 
 
   Debug.Log("on gui fnc "+Rname );
     
 
       if(showLOc)
     {
              
            
           
          Pos =    activeChild.transform.position;
      
      GUI.Label (Rect(110,Screen.height-40,550,70), "Region:" + Pos.ToString());
      
      
      GUI.Label (Rect(110,Screen.height-60,550,70), "Region:" + Rname);
      str = null;
      
          
      }
  
 }
 
 function Update () 
 {
     if (Input.GetKeyDown(KeyCode.C)) 
         showLOc = !showLOc;
         setlayer();
 }
 
 
 
 function setlayer()
 {
     for (var child : Transform in player.transform)
     {
         if(child.active)
             activeChild = child.transform.gameObject;
             
     } 
 }

Thanks AR