void Awake()
{
backButton.onClick.RemoveAllListeners();
LoadScene ls = GameObject.Find("Script").GetComponent <LoadScene> ();
backButton.onClick.AddListener(() => ls.LoadScene_OutNetMenu("MainMenu"));
LoadingScene ls2 = GameObject.Find("Script").GetComponent <LoadingScene> ();
backButton.onClick.AddListener(() => ls2.playSoundBack());
}