function $(tagId) {
	return document.getElementById(tagId);
}
//index
function homenaviOn(obj) {
	$(obj).src = 'imgs/navi/navi-' + obj + '.gif';
}

function homenaviOff(obj) {
	$(obj).src = 'imgs/navi/navi-' + obj + '.jpg';
}
//1st level
function naviOn2(obj) {
	$(obj).src = 'imgs/navi/navi-' + obj + '.gif';
}

function naviOff2(obj) {
	$(obj).src = 'imgs/navi/navi-' + obj + '-off.gif';
}
//2nd level
function naviOn(obj) {
	$(obj).src = '../imgs/navi/navi-' + obj + '.gif';
}

function naviOff(obj) {
	$(obj).src = '../imgs/navi/navi-' + obj + '-off.gif';
}

function subnaviOn(obj) {
	$(obj).src = '../imgs/subnavi/' + obj + '-on.gif';
}

function subnaviOff(obj) {
	$(obj).src = '../imgs/subnavi/' + obj + '-off.gif';
}