bu05_01_on = new Image();
bu05_01_on.src = "../image/submenu/bu05_01_on.gif";
bu05_01_off= new Image();
bu05_01_off.src= "../image/submenu/bu05_01_off.gif";

bu05_02_on = new Image();
bu05_02_on.src = "../image/submenu/bu05_02_on.gif";
bu05_02_off= new Image();
bu05_02_off.src= "../image/submenu/bu05_02_off.gif";