Camera rotation - button emulation

Hi all~

I found this script earlier (see below) and would like to implement the camera rotation effect on a button - but preferably when the user moves their cursor to the edges of the screen.

p.s. I am noob with scripting

Thanks

var target : Transform;

var edgeBorder = 0.1;

var horizontalSpeed = 360.0;

var verticalSpeed = 120.0;

var minVertical = 20.0;

var maxVertical = 90.0;

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;

 ret

``urn Mathf.Clamp (angle, min, max);

}