function checkit0() { 
 document.getElementById('feld0').style.display = "inline";
 document.getElementById('feld1').style.display = "none";
 document.getElementById('feld2').style.display = "none";
 document.getElementById('feld3').style.display = "none";
 document.getElementById('feld4').style.display = "none";
 document.getElementById('feld5').style.display = "none";
 document.getElementById('feld6').style.display = "none";
}

function checkit1() { 
 document.getElementById('feld0').style.display = "none";
 document.getElementById('feld1').style.display = "inline";
 document.getElementById('feld2').style.display = "none";
 document.getElementById('feld3').style.display = "none";
 document.getElementById('feld4').style.display = "none";
 document.getElementById('feld5').style.display = "none";
 document.getElementById('feld6').style.display = "none";
}
function checkit2() { 
 document.getElementById('feld0').style.display = "none";
 document.getElementById('feld1').style.display = "none";
 document.getElementById('feld2').style.display = "inline";
 document.getElementById('feld3').style.display = "none";
 document.getElementById('feld4').style.display = "none";
 document.getElementById('feld5').style.display = "none";
 document.getElementById('feld6').style.display = "none";
}

function checkit3() { 
 document.getElementById('feld0').style.display = "none";
 document.getElementById('feld1').style.display = "none";
 document.getElementById('feld2').style.display = "none";
 document.getElementById('feld3').style.display = "inline";
 document.getElementById('feld4').style.display = "none";
 document.getElementById('feld5').style.display = "none";
 document.getElementById('feld6').style.display = "none";
}
function checkit4() { 
 document.getElementById('feld0').style.display = "none";
 document.getElementById('feld1').style.display = "none";
 document.getElementById('feld2').style.display = "none";
 document.getElementById('feld3').style.display = "none";
 document.getElementById('feld4').style.display = "inline";
 document.getElementById('feld5').style.display = "none";
 document.getElementById('feld6').style.display = "none";
}
function checkit5() { 
 document.getElementById('feld0').style.display = "none";
 document.getElementById('feld1').style.display = "none";
 document.getElementById('feld2').style.display = "none";
 document.getElementById('feld3').style.display = "none";
 document.getElementById('feld4').style.display = "none";
 document.getElementById('feld5').style.display = "inline";
 document.getElementById('feld6').style.display = "none";
}
function checkit6() { 
 document.getElementById('feld0').style.display = "none";
 document.getElementById('feld1').style.display = "none";
 document.getElementById('feld2').style.display = "none";
 document.getElementById('feld3').style.display = "none";
 document.getElementById('feld4').style.display = "none";
 document.getElementById('feld5').style.display = "none";
 document.getElementById('feld6').style.display = "inline";
}

function login_nav() {
  if (document.getElementById('nav_login1').style.display == "inline") {
    document.getElementById('nav_login1').style.display = "none";
    document.getElementById('nav_login2').style.display = "inline";
  } else {
    document.getElementById('nav_login1').style.display = "inline";
    document.getElementById('nav_login2').style.display = "none";
  }
}





function checkfadeout() {
  aktiv = setTimeout("checkit0()", 5000);
}
function abbrechen() {
  clearTimeout(aktiv);
}