parallax on x, But how on the y as well? [Solved]

Hi.

I've made a script and it works. But my problem is that it only "scrolls?" on the x. And my question is, how do I need to make it so that it also gives this effect on the y?

 using UnityEngine;
 using System.Collections;
 
 public class Paralaxing : MonoBehaviour {
 
     public Transform[] Backgrounds;                //Array of background and forground
     private float[] ParallaxScales;
     public float Smoothing = 1f;                        //Minimal 1
 
     private Transform cam;
     private Vector3 PreCamPo;
 
     void Awake(){
         cam = Camera.main.transform;
     }
 
     // Use this for initialization
     void Start () {
         PreCamPo = cam.position;
 
         ParallaxScales = new float[Backgrounds.Length];
 
         for (int i = 0; i < Backgrounds.Length; i++) {
             ParallaxScales [i] = Backgrounds [i].position.z * -1;
         }
     }
     
     // Update is called once per frame
     void Update () {
 
         for (int i = 0; i < Backgrounds.Length; i++) {
             float parallax = (PreCamPo.x - cam.position.x) * ParallaxScales [i];
 
             float BackgroundTargetPosX = Backgrounds [i].position.x + parallax;
 
             Vector3 BackgroundTargetPos = new Vector3 (BackgroundTargetPosX, Backgrounds [i].position.y, Backgrounds [i].position.z);
 
             Backgrounds [i].position = Vector3.Lerp (Backgrounds [i].position, BackgroundTargetPos, Smoothing * Time.deltaTime);
 
 
         }
 
         PreCamPo = cam.position;
     }
 }
 

Hope it is an easy fix. Thanks.

-coasterMind

Script is halv copied from Brackeys.