function showErsterReiter() {
var Reiter1 = document.getElementById("Reiter1");
var Reiter2 = document.getElementById("Reiter2");
var aReiter1 = document.getElementById("aReiter1");
var aReiter2 = document.getElementById("aReiter2");
Reiter1.style.display = "block";
Reiter2.style.display = "none";
aReiter1.style.borderBottom = "1px solid #fff";
aReiter2.style.borderBottom = "1px solid #A87B01";
}

function showZweiterReiter() {
var Reiter1 = document.getElementById("Reiter1");
var Reiter2 = document.getElementById("Reiter2");
var aReiter1 = document.getElementById("aReiter1");
var aReiter2 = document.getElementById("aReiter2");
Reiter1.style.display = "none";
Reiter2.style.display = "block";
aReiter1.style.borderBottom = "1px solid #A87B01";
aReiter2.style.borderBottom = "1px solid #fff";
}