if (document.images) {
	img1on = new Image();
	img1on.src = "../img/menu_btn01on.jpg";
	img1off = new Image();
	img1off.src = "../img/menu_btn01.jpg";
	img2on = new Image();
	img2on.src = "../img/menu_btn02on.jpg";
	img2off = new Image();
	img2off.src = "../img/menu_btn02.jpg";
	img3on = new Image();
	img3on.src = "../img/menu_btn03on.jpg";
	img3off = new Image();
	img3off.src = "../img/menu_btn03.jpg";
	img4on = new Image();
	img4on.src = "../img/menu_btn04on.jpg";
	img4off = new Image();
	img4off.src = "../img/menu_btn04.jpg";
	img5on = new Image();
	img5on.src = "../img/menu_btn05on.jpg";
	img5off = new Image();
	img5off.src = "../img/menu_btn05.jpg";
	img6on = new Image();
	img6on.src = "../img/menu_btn06on.jpg";
	img6off = new Image();
	img6off.src = "../img/menu_btn06.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");
	}
}