function swapClasses(element) {
	if (document.getElementById) {
		var liClass = 'eintrag'+ element;
		var picture = 'pic' + element;
		document.getElementById(liClass).className = (document.getElementById(liClass).className == 'open') ? 'closed' : 'open';
		document.getElementById(picture).src = (document.getElementById(liClass).className == 'open') ? 'fileadmin/resources/minus.gif' : 'fileadmin/resources/plus.gif';
	}
}