function gehe_start() {
  var myAjax = new Ajax.Request(
    "./php/start.php",
    { method: 'get', onComplete: zeige_content }
  );
}

function zeige_content( originalRequest ) {
   document.getElementById('content').innerHTML = originalRequest.responseText;
}

function gehe_vet() {
  var myAjax = new Ajax.Request(
    "./php/vet.php",
    { method: 'get', onComplete: zeige_content }
  );
}

function gehe_mitglied() {
  var myAjax = new Ajax.Request(
    "./php/mitglied.php",
    { method: 'get', onComplete: zeige_content }
  );
}

function gehe_datenschutz() {
  var myAjax = new Ajax.Request(
    "./php/datenschutz.php",
    { method: 'get', onComplete: zeige_content }
  );
}

function gehe_kontakt() {
  var myAjax = new Ajax.Request(
    "./php/kontakt.php",
    { method: 'get', onComplete: zeige_content }
  );
}

function gehe_impressum() {
  var myAjax = new Ajax.Request(
    "./php/impressum.php",
    { method: 'get', onComplete: zeige_content }
  );
}