var instructor_btn_on=new Image();
instructor_btn_on.src="./img/inst_btn_a.jpg";
var instructor_btn_off=new Image();
instructor_btn_off.src="./img/inst_btn.jpg";

var item_btn_on=new Image();
item_btn_on.src="./img/shop_btn_a.jpg";
var item_btn_off=new Image();
item_btn_off.src="./img/shop_btn.jpg";

var back_btn_on=new Image();
back_btn_on.src="./img/back_btn_a.jpg";
var back_btn_off=new Image();
back_btn_off.src="./img/back_btn.jpg";

var ask_btn_on=new Image();
ask_btn_on.src="./img/toiawase_a.jpg";
var ask_btn_off=new Image();
ask_btn_off.src="./img/toiawase.jpg";

var banner01_on=new Image();
banner01_on.src="./img/banner_1a.jpg";
var banner01_off=new Image();
banner01_off.src="./img/banner_1.jpg";

var banner02_on=new Image();
banner02_on.src="./img/banner_2a.jpg";
var banner02_off=new Image();
banner02_off.src="./img/banner_2.jpg";

var banner03_on=new Image();
banner03_on.src="./img/banner_3a.jpg";
var banner03_off=new Image();
banner03_off.src="./img/banner_3.jpg";

var banner04_on=new Image();
banner04_on.src="./img/banner_4a.jpg";
var banner04_off=new Image();
banner04_off.src="./img/banner_4.jpg";

var banner05_on=new Image();
banner05_on.src="./img/banner_5a.jpg";
var banner05_off=new Image();
banner05_off.src="./img/banner_5.jpg";

var banner06_on=new Image();
banner06_on.src="./img/banner_6a.jpg";
var banner06_off=new Image();
banner06_off.src="./img/banner_6.jpg";

var banner08_on=new Image();
banner08_on.src="./img/banner_8a.jpg";
var banner08_off=new Image();
banner08_off.src="./img/banner_8.jpg";

var banner09_on=new Image();
banner09_on.src="./img/banner_9a.jpg";
var banner09_off=new Image();
banner09_off.src="./img/banner_9.jpg";

var banner010_on=new Image();
banner010_on.src="./img/banner_10a.jpg";
var banner010_off=new Image();
banner010_off.src="./img/banner_10.jpg";