function getMenuSrcNormal(id) {
	switch (id) {
	case  1: return '/common/img/header/menu_top1.gif'; break;
	case  2: return '/common/img/header/menu_top2.gif'; break;
	case  3: return '/common/img/header/menu_top3.gif'; break;
	default: return ''; break;
	}
}

function getMenuSrcActive(id) {
	switch (id) {
	case  1: return '/common/img/header/menu_top1a.gif'; break;
	case  2: return '/common/img/header/menu_top2a.gif'; break;
	case  3: return '/common/img/header/menu_top3a.gif'; break;
	default: return ''; break;
	}
}

function setMenuNormal(id) {
	document.getElementById('menu' + id).src = getMenuSrcNormal(id);
}

function setMenuActive(id) {
	document.getElementById('menu' + id).src = getMenuSrcActive(id);
}