Mouse mapping

using UnityEngine;
using System.Collections;

public class cursorController : MonoBehaviour {

    public GameObject cursor00;
    public GameObject cursor11;
    public GameObject mouse00;
    public GameObject mouse11;
    public GameObject mouseModel;

    Vector2 mapMouse(Vector3 screenZero, Vector3 screenOne, bool useZ){
        Vector2 mouse = new Vector2(Input.mousePosition.x/Screen.width, Input.mousePosition.y/Screen.height);
        float cursorX = Mathf.Lerp(screenOne.x, screenZero.x, mouse.x);
        float cursorY;
        if(useZ){
            cursorY = Mathf.Lerp(screenZero.z, screenOne.z, mouse.y);
        }
        else{
            cursorY = Mathf.Lerp(screenZero.y, screenOne.y, mouse.y);
        }



        return new Vector2(cursorX,cursorY);
    }



    // Update is called once per frame
    void Update () {
        //Cursor
        Vector2 cursor = mapMouse(cursor00.transform.position, cursor11.transform.position, false);
        transform.position = new Vector3(cursor.x,cursor.y, transform.position.z);

        //mouse
        Vector2 mousePos = mapMouse(mouse00.transform.position, mouse11.transform.position, true);
        mouseModel.transform.position = new Vector3(mousePos.x, mouseModel.transform.position.y, mousePos.y);



    }
}