function doKalenderPageUpdate() {
  if($('#art').val() == 'lehrgang') {
    params = 'von=' + $('#von').val() + '-und-bis=' + $('#bis').val() + '-und-lfv=' + $('#lfv').val() + '-und-nation=' + $('#nation').val() + '-und-kat=' + $('#kat').val() + '-und-art=' + $('#art').val();
  } else {
    params = 'von=' + $('#von').val() + '-und-bis=' + $('#bis').val() + '-und-lfv=' + $('#lfv').val() + '-und-nation=' + $('#nation').val() + '-und-kat=' + $('#kat').val() + '-und-waffe=' + $('#waffe').val() + '-und-ak=' + $('#ak').val() + '-und-art=' + $('#art').val();
  }
  if(document.getElementById('kalender')) {
    $('#kalender').html('<center><img src="http://static.fechten.org/icon/ajax.gif" alt="Anwendung l&auml;dt!" /></center>');
    $.ajax({
      url: '/ajax/call.php',
      data: 'call=kalender&data=/termine/--' + params,
      success: function(data) {
          $('#kalender').html(data);
      }
    });
  }
}