function change(obj) {
  Zero.style.display = "none";
  First.style.display = "none";
  Second.style.display = "none";
  Third.style.display = "none";
  Four.style.display = "none";
  Five.style.display = "none";
  Six.style.display = "none";
  Seven.style.display = "none";
  Eight.style.display = "none";

  obj.style.display = "block";
}