// Funktion zum gleichzeitigen ein- ausblenden von Layern

function eins() {
    if(document.getElementById("eins").style.display == "none" ) {
    document.getElementById("eins").style.display = "block";
	document.getElementById("zwei").style.display = "none";
  }
  else {
  if(document.getElementById("eins").style.display == "block" ) {
  document.getElementById("eins").style.display = "none";
  }
  }
}
function zwei() {
  if(document.getElementById("zwei").style.display == "none" ) {
    document.getElementById("zwei").style.display = "block";
	document.getElementById("eins").style.display = "none";
  }
  else {
  if(document.getElementById("zwei").style.display == "block" ) {
    document.getElementById("zwei").style.display = "none";
	  }
  }
}