Crosshair and DoorOpening

using UnityEngine;
using System.Collections;

public class CrosshairScript : MonoBehaviour
{

    public Texture2D crosshairTexture;

    public int speed;
    public float friction;
    public float lerpSpeed;
    public float xDeg;
    public float yDeg;
    public Quaternion fromRotation;
    public Quaternion toRotation;

    void Start()
    {
        Cursor.visible = false;
    }

    void Update()
    {
        Ray ray = Camera.main.ScreenPointToRay(new Vector2 (Screen.width/2, Screen.height/2));
        RaycastHit hit;
        if(Physics.Raycast(ray, out hit, 10))
        {
            if (hit.collider.tag == "Bookcase_door")
            {
                if (Input.GetMouseButton(0))
                {
                    if(Input.GetAxis("Mouse X") > 0)
                    {
                        Debug.Log(Input.GetAxis("Mouse X"));
                        //xDeg -= Input.GetAxis("Mouse X") * speed * friction;
                        yDeg += Input.GetAxis("Mouse Y") * speed * friction;
                        fromRotation = hit.transform.rotation;
                        toRotation = Quaternion.Euler(0, yDeg, 0);
                        hit.transform.rotation = Quaternion.Lerp(fromRotation, toRotation, Time.deltaTime * lerpSpeed);
                    }
                    else if(Input.GetAxis("Mouse X") < 0)
                    {
                        Debug.Log(Input.GetAxis("Mouse X"));
                        //xDeg -= Input.GetAxis("Mouse X") * speed * friction;
                        yDeg -= Input.GetAxis("Mouse Y") * speed * friction;
                        fromRotation = hit.transform.rotation;
                        toRotation = Quaternion.Euler(0, yDeg, 0);
                        hit.transform.rotation = Quaternion.Lerp(fromRotation, toRotation, Time.deltaTime * lerpSpeed);
                    }

                }
            }
            else if (hit.collider.tag == "Door")
            {
                if (Input.GetMouseButton(0))
                {
                    Debug.Log("Clicked Bookcase Door!");
                    xDeg -= Input.GetAxis("Mouse X") * speed * friction;
                    //yDeg += Input.GetAxis("Mouse Y") * speed * friction;
                    fromRotation = hit.transform.rotation;
                    toRotation = Quaternion.Euler(0, xDeg, 0);
                    hit.transform.rotation = Quaternion.Lerp(fromRotation, toRotation, Time.deltaTime * lerpSpeed);
                }
            }

        }
    }

    void OnGUI()
    {
        GUI.DrawTexture(new Rect(Screen.width / 2-4, Screen.height / 2-4, 8, 8), crosshairTexture);
    }

}