Help with Changing the Sprite image in the Script

I am still somewhat new to coding, and i need help changing a sprite of an image. there are two sprites, 1 shows the image i want to project, and the other is a button that changes the image of the first sprite. only the second sprite has the script, but i'm not sure where i went wrong. here is the script:

using UnityEngine; using System.Collections;

public class ChangeImage : MonoBehaviour {

 public GameObject Scene;
 public Sprite IMG_0078;
 public Sprite IMG_0079;
 public Sprite IMG_0080;
 public Sprite IMG_0094;
 // Use this for initialization
 void Start () {

     Scene = GetComponent<SpriteRenderer> ();

 
 }

 void OnMouseDown()
 {
     SetSprite ();
     }

 // Update is called once per frame

 void SetSprite () 
 {
 if (SpriteRenderer.Sprite == IMG_0078)
 {
     SpriteRenderer.Sprite = IMG_0079;
     }
 if (SpriteRenderer.Sprite == IMG_0079)
 {
     SpriteRenderer.Sprite = IMG_0080;
 }
 if (SpriteRenderer.Sprite == IMG_0080)
 {
     SpriteRenderer.Sprite = IMG_0094;
 }

} void Update () {

}

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