var target : Transform;
  var edgeBorder = 0.1;
  var horizontalSpeed = 360.0;
  var verticalSpeed = 120.0;
  var minVertical = 20.0;
  var maxVertical = 85.0;
  
  private var x = 0.0;
  private var y = 0.0;
  private var distance = 0.0;
  
  function Start()
  {
          x = transform.eulerAngles.y;
      y = transform.eulerAngles.x;
      distance = (transform.position - target.position).magnitude;
  }
  
  function LateUpdate()
  {
          var dt = Time.deltaTime;
          x -= Input.GetAxis("Horizontal") * horizontalSpeed * dt;
          y += Input.GetAxis("Vertical") * verticalSpeed * dt;
          
          y = ClampAngle(y, minVertical, maxVertical);
           
          var rotation = Quaternion.Euler(y, x, 0);
          var position = rotation * Vector3(0.0, 0.0, -distance) + target.position;
          
          transform.rotation = rotation;
          transform.position = position;
  }
  
  static function ClampAngle (angle : float, min : float, max : float) {
          if (angle < -360)
                  angle += 360;
          if (angle > 360)
                  angle -= 360;
          return Mathf.Clamp (angle, min, max);
  }