if (document.images) {
	img1on = new Image();
	img1on.src = "images/btn_1_r.jpg";
	img1off = new Image();
	img1off.src = "images/btn_1.jpg";
	img2on = new Image();
	img2on.src = "images/btn_2_r.jpg";
	img2off = new Image();
	img2off.src = "images/btn_2.jpg";
	img3on = new Image();
	img3on.src = "images/btn_3_r.jpg";
	img3off = new Image();
	img3off.src = "images/btn_3.jpg";
	img4on = new Image();
	img4on.src = "images/btn_4_r.jpg";
	img4off = new Image();
	img4off.src = "images/btn_4.jpg";
	img5on = new Image();
	img5on.src = "images/btn_5_r.jpg";
	img5off = new Image();
	img5off.src = "images/btn_5.jpg";
	img6on = new Image();
	img6on.src = "images/btn_6_r.jpg";
	img6off = new Image();
	img6off.src = "images/btn_6.jpg";
	img10on = new Image();
	img10on.src = "images/banner_reform_r.jpg";
	img10off = new Image();
	img10off.src = "images/banner_reform.jpg";
	img11on = new Image();
	img11on.src = "images/banner_happy_r.jpg";
	img11off = new Image();
	img11off.src = "images/banner_happy.jpg";
	img12on = new Image();
	img12on.src = "images/banner_mail_r.jpg";
	img12off = new Image();
	img12off.src = "images/banner_mail.jpg";
	img13on = new Image();
	img13on.src = "images/toiawase_r.jpg";
	img13off = new Image();
	img13off.src = "images/toiawase.jpg";
}
function imgOn(imgName) {
	if (document.images) {
		document[imgName].src=eval(imgName+"on.src");
	}
}
function imgOff(imgName) {
	if (document.images) {
		document[imgName].src=eval(imgName+"off.src");
	}
}