function kontextnav(pSwitch) {
  alledivs = document.getElementById('spalte_2').getElementsByTagName('div');
  for (var i=0; i<alledivs.length; i++) {
    if (alledivs[i].className == 'kontextnavigation') {
      switch (pSwitch) {
        case 0:
          alledivs[i].style.display = 'none';
          document.getElementById('kontextnavigation_schalter').innerHTML = '<a href="javascript:void(0)" onclick="kontextnav(1)" title="Navigation einblenden" class="off">Navigation einblenden</a>';
          break;
        case 1:
          alledivs[i].style.display = 'block';
          document.getElementById('kontextnavigation_schalter').innerHTML = '<a href="javascript:void(0)" onclick="kontextnav(0)" title="Navigation ausblenden" class="on">Navigation ausblenden</a>';
          break;
      } 
    }
  }
}

function kontextnav_neu(pMenue,pLink) {
  var menu = document.getElementById(pMenue);
  if (pLink.className == 'off') {
    pLink.className = 'on';
    menu.style.display = 'block'; 
  } else {
    pLink.className = 'off';
    menu.style.display = 'none';
  }
}