if (document.images) {
	menu00 = new Image();
	menu00.src = "images/common/menu00.gif";
	menu01 = new Image();
	menu01.src = "images/common/menu01.gif";
	menu02 = new Image();
	menu02.src = "images/common/menu02.gif";
	menu03 = new Image();
	menu03.src = "images/common/menu03.gif";
	menu04 = new Image();
	menu04.src = "images/common/menu04.gif";

	menu00_over = new Image();
	menu00_over.src = "images/common/menu00_over.gif";
	menu01_over = new Image();
	menu01_over.src = "images/common/menu01_over.gif";
	menu02_over = new Image();
	menu02_over.src = "images/common/menu02_over.gif";
	menu03_over = new Image();
	menu03_over.src = "images/common/menu03_over.gif";
	menu04_over = new Image();
	menu04_over.src = "images/common/menu04_over.gif";

	menu00a = new Image();
	menu00a.src = "images/common/menu00a.gif";
	menu01a = new Image();
	menu01a.src = "images/common/menu01a.gif";
	menu02a = new Image();
	menu02a.src = "images/common/menu02a.gif";
	menu03a = new Image();
	menu03a.src = "images/common/menu03a.gif";
	menu04a = new Image();
	menu04a.src = "images/common/menu04a.gif";

	menu00a_over = new Image();
	menu00a_over.src = "images/common/menu00a_over.gif";
	menu01a_over = new Image();
	menu01a_over.src = "images/common/menu01a_over.gif";
	menu02a_over = new Image();
	menu02a_over.src = "images/common/menu02a_over.gif";
	menu03a_over = new Image();
	menu03a_over.src = "images/common/menu03a_over.gif";
	menu04a_over = new Image();
	menu04a_over.src = "images/common/menu04a_over.gif";
}

function imgOff(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + ".src");
	}
}

function imgOn(imgName) {
	if (document.images) {
		document[imgName].src = eval(imgName + "_over.src");
	}
}