function openMenu(n) {         //リストを開く
  closeMenu()         //表示中のリストを閉じ､
  if(n == 1) {         //リスト１を開く
     li1.style.display = "block"; //ブロックにすることで文字以外のところも選択可能
  }
  else if(n == 2) {
     li2.style.display = "block";
  }
  else if(n == 3) {
     li3.style.display = "block";
  }
  else if(n == 4) {
     li4.style.display = "block";
  }
  else if(n == 5) {
     li5.style.display = "block";
  }
  else if(n == 6) {
     li6.style.display = "block";
  }
  else if(n == 7) {
     li7.style.display = "block";
  }
  else if(n == 8) {
     li8.style.display = "block";
  }
  else if(n == 9) {
     li9.style.display = "block";
  }
}
function closeMenu() {         //リストを閉じ､
  li1.style.display = "none";  //非表示
  li2.style.display = "none";
  li3.style.display = "none";
  li4.style.display = "none";
  li5.style.display = "none";
  li6.style.display = "none";
  li7.style.display = "none";
  li8.style.display = "none";
  li9.style.display = "none";
}