function anzeigen(das) {
	if (anzeigen.last) anzeigen.last.style.display='none';
	var e = document.getElementById(das);
	e.style.display='block';
	anzeigen.last = e;
}

function zeigen(dies) {
	var f = document.getElementById('0');
	if (zeigen.last) zeigen.last.style.display = 'none';
	else if (f.style.display=='block') f.style.display = 'none';
	var g = document.getElementById(dies);
	g.style.display = 'block';
	zeigen.last = g;
}