public void Next2()
 {
     D2.SetActive(false);
     D3.SetActive(true);
     Nex2.SetActive(false);
     Nex3.SetActive(true);
 }
 public void Next1()
 {
     D1.SetActive(false);
     D2.SetActive(true);
     Next.SetActive(false);
     Nex2.SetActive(true);
 }