var aktiverName = '';
function anzeigen (anzeigeName) {				
	if (aktiverName == anzeigeName && aktiverName != '') {
		document.getElementById(aktiverName).style.display = 'none';
		document.getElementById(aktiverName + 'Btn').src = 'images/up2.gif';
		aktiverName = '';			
	}
	else {
		if (aktiverName != '') {
			document.getElementById(aktiverName).style.display = 'none';
			document.getElementById(aktiverName + 'Btn').src = 'images/up2.gif';
		}
		document.getElementById(anzeigeName).style.display = 'block';
		document.getElementById(anzeigeName + 'Btn').src = 'images/down2.gif';
		aktiverName = anzeigeName;
	}				
}