// プルダウンメニュー
flag = false;
function pullDown1() {
  if(flag) ID1.style.visibility = "hidden";
  else ID1.style.visibility = "visible";
  flag = !flag;
}
flag = false;
function pullDown2() {
  if(flag) ID2.style.visibility = "hidden";
  else ID2.style.visibility = "visible";
  flag = !flag;
}