function neuAufbau () {
  if (browser()){
    document.getElementById("videoLayer").style.width = window.innerWidth+"px";
    document.getElementById("videoLayer").style.height = window.innerHeight+"px";
  } else {
    document.getElementById("videoLayer").style.width = document.body.offsetWidth+"px";
    document.getElementById("videoLayer").style.height = document.documentElement.clientHeight+"px";
  }
}
function browser() {
  if (navigator.appName.indexOf("Internet Explorer") != -1){
    return false;
  } else {
    return true;
  }
}
function shutoffVideo(){
  document.getElementById("videoLayer").style.display = "none";
  var myPlayer = document.getElementById('ytPlayer');
  myPlayer.stopVideo();
}
function callVideo(){
  document.getElementById("videoLayer").style.display = "block";
}