Unity 3d Mouselook Pivot

using UnityEngine;
using System.Collections;

public class MouseLookPivot : MonoBehaviour {

    public float turnSpeed = 1;
    public float tiltRange = 45;

    float lookAngle = 0;
    float tiltAngle = 0;


    // Update is called once per frame
    void Update () {

        float x = Input.GetAxis("Mouse X");
        float y = Input.GetAxis("Mouse Y");

        lookAngle += x*turnSpeed;
        tiltAngle += y*turnSpeed;

        tiltAngle = Mathf.Clamp (tiltAngle, -tiltRange, tiltRange);

        transform.rotation = Quaternion.Euler( tiltAngle, lookAngle, 0);

    }
}