// objectRotater: Rotates the object to which it is attached.
  // Useful for collectable items, etc.
  
  function Update () 
  {
          transform.Rotate (0, 45 * Time.deltaTime, 0);
  }
  
  function OnBecameVisible()
  {
          enabled = true;        
  }
  
  function OnBecameInvisible()
  {
          enabled = false;        
  }