if (document.images) {
	idx1on = new Image();
	idx1on.src = "index_img/index_btn01on.jpg";
	idx1off = new Image();
	idx1off.src = "index_img/index_btn01.jpg";
	idx2on = new Image();
	idx2on.src = "index_img/index_btn02on.jpg";
	idx2off = new Image();
	idx2off.src = "index_img/index_btn02.jpg";
	idx3on = new Image();
	idx3on.src = "index_img/index_btn03on.jpg";
	idx3off = new Image();
	idx3off.src = "index_img/index_btn03.jpg";
	idx4on = new Image();
	idx4on.src = "index_img/index_btn04on.jpg";
	idx4off = new Image();
	idx4off.src = "index_img/index_btn04.jpg";
	idx5on = new Image();
	idx5on.src = "index_img/index_btn05on.jpg";
	idx5off = new Image();
	idx5off.src = "index_img/index_btn05.jpg";
	idx6on = new Image();
	idx6on.src = "index_img/index_btn06on.jpg";
	idx6off = new Image();
	idx6off.src = "index_img/index_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");
	}
}