function showNovitaeten() {
            document.getElementById('novitaeten').style.display = "block";
            document.getElementById('nentwig').style.display = "none";
            document.getElementById('blecher').style.display = "none";
            document.getElementById('ethik').style.display = "none";
            document.getElementById('buerger').style.display = "none";
            document.getElementById('frei').style.display = "none";
            document.getElementById('default').style.display = "none";
        }
        function showNentwig() {
            document.getElementById('novitaeten').style.display = "none";
            document.getElementById('nentwig').style.display = "block";
            document.getElementById('blecher').style.display = "none";
            document.getElementById('ethik').style.display = "none";
            document.getElementById('buerger').style.display = "none";
            document.getElementById('frei').style.display = "none";
            document.getElementById('default').style.display = "none";
        }
        function showBlecher() {
            document.getElementById('novitaeten').style.display = "none";
            document.getElementById('nentwig').style.display = "none";
            document.getElementById('blecher').style.display = "block";
            document.getElementById('ethik').style.display = "none";
            document.getElementById('buerger').style.display = "none";
            document.getElementById('frei').style.display = "none";
            document.getElementById('default').style.display = "none";
        }
        function showEthik() {
            document.getElementById('novitaeten').style.display = "none";
            document.getElementById('nentwig').style.display = "none";
            document.getElementById('blecher').style.display = "none";
            document.getElementById('ethik').style.display = "block";
            document.getElementById('buerger').style.display = "none";
            document.getElementById('frei').style.display = "none";
            document.getElementById('default').style.display = "none";
        }
        function showBuerger() {
            document.getElementById('novitaeten').style.display = "none";
            document.getElementById('nentwig').style.display = "none";
            document.getElementById('blecher').style.display = "none";
            document.getElementById('ethik').style.display = "none";
            document.getElementById('buerger').style.display = "block";
            document.getElementById('frei').style.display = "none";
            document.getElementById('default').style.display = "none";
        }
        function showFrei() {
            document.getElementById('novitaeten').style.display = "none";
            document.getElementById('nentwig').style.display = "none";
            document.getElementById('blecher').style.display = "none";
            document.getElementById('ethik').style.display = "none";
            document.getElementById('buerger').style.display = "none";
            document.getElementById('frei').style.display = "block";
            document.getElementById('default').style.display = "none";
        }