function preLoadImg(URL){

		arrImgList = new Array (
			"../images-bt2/bt_home_on.jpg",
			"../images-bt2/bt_english_on.jpg",
			"../images-bt2/bt_japanese_on.jpg",
			"../images-bt2/bt_shop_on.jpg",
			"../images-bt2/bt_menus_0101on.jpg",
			"../images-bt2/bt_menus_0102on.jpg",
			"../images-bt2/bt_menus_0103on.jpg",
			"../images-bt2/bt_menus_0201on.jpg",
			"../images-bt2/bt_menus_0201z01on.jpg",
			"../images-bt2/bt_menus_0202on.jpg",
			"../images-bt2/bt_menus_0202z01on.jpg",
			"../images-bt2/bt_menus_0301on.jpg",
			"../images-bt2/bt_menus_0302on.jpg",
			"../images-bt2/bt_menus_0401on.jpg",
			"../images-bt2/bt_menus_0402on.jpg",
			"../images-bt2/bt_menus_0501on.jpg",
			"../images-bt2/bt_menus_0502on.jpg",
			"../images-bt2/bt_menus_0503on.jpg",
			"../images-bt2/bt_menus_0601on.jpg",
			"../images-bt2/bt_menus_0602on.jpg",
			"../images-bt2/bt_menus_0701on.jpg",
			"../images-bt2/bt_menus_0702on.jpg",
			"../images-bt2/bt_menus_0703on.jpg",
			"../images-bt2/bt_menus_0801on.jpg",
			"../images-bt2/bt_menus_0802on.jpg",
			"../images-bt2/bt_menus_0803on.jpg",
			"../images-bt2/bt_menus_e0101on.jpg",
			"../images-bt2/bt_menus_e0102on.jpg",
			"../images-bt2/bt_menus_e0103on.jpg",
			"../images-bt2/bt_menus_e0201on.jpg",
			"../images-bt2/bt_menus_e0202on.jpg",
			"../images-bt2/bt_menus_e0801on.jpg",
			"../images-bt2/"
		);
		arrPreLoad = new Array();
		for (i in arrImgList) {
			arrPreLoad[i] = new Image();
			arrPreLoad[i].src = arrImgList[i];
		}
		preLoadFlag = "true";
	}