function preload() {
  home2 = new Image();
  home2.src = "./button/home2.jpg";
  menu2 = new Image();
  menu2.src = "./button/nikki2.jpg";
  mae2 = new Image();
  mae2.src = "./button/mae2.jpg";
  tugi2 = new Image();
  tugi2.src = "./button/tugi2.jpg";
}