function showFabiani () {
  document.getElementById('f1').innerHTML = 'Kontakt';
  document.getElementById('f2').innerHTML = 'Schwerpunkte';
  document.getElementById('f3').innerHTML = 'Verfügbarkeit';
  document.getElementById('f4').innerHTML = 'Profil';
  document.getElementById('f5').innerHTML = 'Referenzen';
  document.getElementById('f6').innerHTML = 'Vorträge';

  document.getElementById('p1').innerHTML = '';
  document.getElementById('p2').innerHTML = '';
  document.getElementById('p3').innerHTML = '';
  document.getElementById('p4').innerHTML = '';
  document.getElementById('p5').innerHTML = '';
  document.getElementById('p6').innerHTML = '';

  document.getElementById('s1').innerHTML = '';
  document.getElementById('s2').innerHTML = '';
  document.getElementById('s3').innerHTML = '';
  document.getElementById('s4').innerHTML = '';
  document.getElementById('s5').innerHTML = '';
  document.getElementById('s6').innerHTML = '';

  document.getElementById('fabiani').className = "menuActive";
  document.getElementById('perl').className = "menuNotActive";
  document.getElementById('sonst').className = "menuNotActive";
}
function showPerl () {
  document.getElementById('f1').innerHTML = '';
  document.getElementById('f2').innerHTML = '';
  document.getElementById('f3').innerHTML = '';
  document.getElementById('f4').innerHTML = '';
  document.getElementById('f5').innerHTML = '';
  document.getElementById('f6').innerHTML = '';

  document.getElementById('p1').innerHTML = 'Tips&Tricks';
  document.getElementById('p2').innerHTML = 'Codebeispiele';
  document.getElementById('p3').innerHTML = 'Downloads';
  document.getElementById('p4').innerHTML = 'Warum Perl?';
  document.getElementById('p5').innerHTML = ' ';
  document.getElementById('p6').innerHTML = 'Vorträge';

  document.getElementById('s1').innerHTML = '';
  document.getElementById('s2').innerHTML = '';
  document.getElementById('s3').innerHTML = '';
  document.getElementById('s4').innerHTML = '';
  document.getElementById('s5').innerHTML = '';
  document.getElementById('s6').innerHTML = '';


  document.getElementById('fabiani').className = "menuNotActive";
  document.getElementById('perl').className = "menuActive";
  document.getElementById('sonst').className = "menuNotActive";
}

function showOther () {
  document.getElementById('sonst').className = "menuActive";
  document.getElementById('fabiani').className = "menuNotActive";
  document.getElementById('perl').className = "menuNotActive";

  document.getElementById('f1').innerHTML = '';
  document.getElementById('f2').innerHTML = '';
  document.getElementById('f3').innerHTML = '';
  document.getElementById('f4').innerHTML = '';
  document.getElementById('f5').innerHTML = '';
  document.getElementById('f6').innerHTML = '';

  document.getElementById('p1').innerHTML = '';
  document.getElementById('p2').innerHTML = '';
  document.getElementById('p3').innerHTML = '';
  document.getElementById('p4').innerHTML = '';
  document.getElementById('p5').innerHTML = '';
  document.getElementById('p6').innerHTML = '';

  document.getElementById('s1').innerHTML = 'Links';
  document.getElementById('s2').innerHTML = 'Changehistory';
  document.getElementById('s3').innerHTML = 'Gästebuch';
  document.getElementById('s4').innerHTML = 'Feiertagskalender (langsam)';
  document.getElementById('s5').innerHTML = 'Feiertagskalender (1970-2038)';
  document.getElementById('s6').innerHTML = 'Rechtliches';

}