function openMenu(nIndex) {
	var aMenus = document.getElementsByName("subMenu");

	for(var i = 0; i < aMenus.length; i++) {
		aMenus[i].style.display = "none";
	}

	aMenus[nIndex].style.display = "block";
}

function changeOver(oImg) {
	var strData = oImg.getAttribute("overImg");

	if(strData == null) {
		strData = oImg.src
		oImg.setAttribute("overImg", strData);
	}

	var nIndex = strData.lastIndexOf(".");
	var strResult = strData.substring(0, nIndex) + "on" + strData.substring(nIndex);

	oImg.src = strResult;
}

function changeOut(oImg) {
	var strData = oImg.getAttribute("overImg");
	var strResult;

	if(strData == null) {
		strData = oImg.src;
		var nIndex = strData.lastIndexOf(".");
		strResult = strData.substring(0, nIndex - 2) + strData.substring(nIndex);
	} else {
		strResult = strData;
	}

	oImg.src = strResult;
}