if (document.images) {
	//トップ限定上メニュー
	//ボタン1
	var img1off = new Image();
	img1off.src = "img/menu_01_off.jpg";
	var img1on = new Image();
	img1on.src = "img/menu_01_on.jpg";
	//ボタン2
	var img2off = new Image();
	img2off.src = "img/menu_02_off.jpg";
	var img2on = new Image();
	img2on.src = "img/menu_02_on.jpg";
	//ボタン3
	var img3off = new Image();
	img3off.src = "img/menu_03_off.jpg";
	var img3on = new Image();
	img3on.src = "img/menu_03_on.jpg";
	//ボタン4
	var img4off = new Image();
	img4off.src = "img/menu_04_off.jpg";
	var img4on = new Image();
	img4on.src = "img/menu_04_on.jpg";
	//ボタン5
	var img5off = new Image();
	img5off.src = "img/menu_05_off.jpg";
	var img5on = new Image();
	img5on.src = "img/menu_05_on.jpg";
}