How to add a different crosshair when mouse over an item

Hi there. I found this script on a Unity 5 YouTube tutorial but i would also like to add a mouse over the object and grab crosshair and than default to my standard crosshair.

Script name: PickupScript.cs

 using UnityEngine;
 using System.Collections;
 
 public class PickupScript : MonoBehaviour {
     GameObject mainCamera;
     bool carrying;
     GameObject carriedObject;
     public float distance;
     public float smooth;
 
     void Start () {
         mainCamera = GameObject.FindWithTag("MainCamera");
     }
 
     void Update () {
         if(carrying) {
             carry(carriedObject);
             checkDrop();
         } else {
             pickup();
         }
     }
 
     void rotateObject() {
         carriedObject.transform.Rotate(5,10,15);
     }
 
     void carry(GameObject o) {
         o.transform.position = Vector3.Lerp (o.transform.position, mainCamera.transform.position + mainCamera.transform.forward * distance, Time.deltaTime * smooth);
         o.transform.rotation = Quaternion.identity;
     }
 
     void pickup() {
         if(Input.GetKeyDown (KeyCode.E)) {
             int x = Screen.width / 2;
             int y = Screen.height / 2;
 
             Ray ray = mainCamera.camera.ScreenPointToRay(new Vector3(x,y));
             RaycastHit hit;
             if(Physics.Raycast(ray, out hit)) {
                 Pickupable p = hit.collider.GetComponent<Pickupable>();
                 if(p != null) {
                     carrying = true;
                     carriedObject = p.gameObject;
                     p.gameObject.rigidbody.useGravity = false;
                 }
             }
         }
     }
 
     void checkDrop() {
         if(Input.GetKeyDown (KeyCode.E)) {
             dropObject();
         }
     }
 
     void dropObject() {
         carrying = false;
         carriedObject.gameObject.rigidbody.useGravity = true;
         carriedObject = null;
     }
 }