function gebi(id) { return document.getElementById(id); }

function arts_swtch(id) {
	var obj = gebi(id);
	if (obj == undefined) return false;
	if (obj.className != '') obj.className = '';
	else obj.className = 'closed';
	return false;
}

function sub(num) {
	var obj = gebi('sub'+num);
	if (obj == undefined) return;
	obj.className = 'sub open';
}

function unsub(num) {
	var obj = gebi('sub'+num);
	if (obj == undefined) return;
	obj.className = 'sub';
}