nav_senior_on = new Image;
  nav_senior_on.src = "../menu/senior-2.gif";
  nav_senior_off = new Image;
  nav_senior_off.src = "../menu/senior-1.gif";

nav_hobby_on = new Image;
  nav_hobby_on.src = "../menu/hobby-2.gif";
  nav_hobby_off = new Image;
  nav_hobby_off.src = "../menu/hobby-1.gif";

nav_wine_on = new Image;
  nav_wine_on.src = "../menu/wine-2.gif";
  nav_wine_off = new Image;
  nav_wine_off.src = "../menu/wine-1.gif";

nav_rakugo_on = new Image;
  nav_rakugo_on.src = "../menu/rakugo-2.gif";
  nav_rakugo_off = new Image;
  nav_rakugo_off.src = "../menu/rakugo-1.gif";

nav_top_on = new Image;
  nav_top_on.src = "../menu/home-2.gif";
  nav_top_off = new Image;
  nav_top_off.src = "../menu/home-1.gif";

nav_senior1_on = new Image;
  nav_senior1_on.src = "../menu/senior1-2.gif";
  nav_senior1_off = new Image;
  nav_senior1_off.src = "../menu/senior1-1.gif";

nav_hobby1_on = new Image;
  nav_hobby1_on.src = "../menu/hobby1-2.gif";
  nav_hobby1_off = new Image;
  nav_hobby1_off.src = "../menu/hobby1-1.gif";

nav_wine1_on = new Image;
  nav_wine1_on.src = "../menu/wine1-2.gif";
  nav_wine1_off = new Image;
  nav_wine1_off.src = "../menu/wine1-1.gif";