function menu_level2_show (id) {
	var ul = document.getElementById ('menu_level2_' + id);
	ul.className = '';
	var a = document.getElementById ('menu_a_' + id);
	if (a.className == '') {
		a.className = 'active';
	}
}

function menu_level2_hide (id) {
	var ul = document.getElementById ('menu_level2_' + id);
	ul.className = 'hidden';
	var a = document.getElementById ('menu_a_' + id);
	if (a.className == 'active') {
		a.className = '';
	}
}