if (document.images) {
	img1on = new Image();
	img1on.src = "http://www.trusty2000.co.jp/img/menu_estate2.gif";
	img2on = new Image();
	img2on.src = "http://www.trusty2000.co.jp/img/menu_plant2.gif";
	img3on = new Image();
	img3on.src = "http://www.trusty2000.co.jp/img/menu_fishing2.gif";
	img4on = new Image();
	img4on.src = "http://www.trusty2000.co.jp/img/menu_sec2.gif";
	img5on = new Image();
	img5on.src = "http://www.trusty2000.co.jp/img/menu_other2.gif";

	img1off = new Image();
	img1off.src = "http://www.trusty2000.co.jp/img/menu_estate.gif";
	img2off = new Image();
	img2off.src = "http://www.trusty2000.co.jp/img/menu_plant.gif";
	img3off = new Image();
	img3off.src = "http://www.trusty2000.co.jp/img/menu_fishing.gif";
	img4off = new Image();
	img4off.src = "http://www.trusty2000.co.jp/img/menu_sec.gif";
	img5off = new Image();
	img5off.src = "http://www.trusty2000.co.jp/img/menu_other.gif";

}

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");
	}
}