function frage(frage) {
  for (i = 1; i <= 20; i++) {
    document.getElementById("f" + i).style.display = "none";
  }
  document.getElementById("f" + frage).style.display = "block";
}

function mehr(id) {
  linkid = 'link' + id;
  textid = 'mehr' + id;
  document.getElementById(linkid).style.display = "none";
  document.getElementById(textid).style.display = "block";
}

function fenstersteuerung(url) {
   var fenster = window.open(url, "Neu",
   "height=300,width=480");
   self.name = "Ziel";
   if (fenster.opener == null) {
      fenster.opener = self;
   }
}

function ch1(x){
  var yy=2;
  var z=0;
  var xx="";
  for(var y=0;y<x.length;y++){
    z=x.charCodeAt(y);xx+=String.fromCharCode(z-yy);
  }
  return xx;
}

function msb(x){
  location.href=ch1(x);
}

function clearInput() {
  document.getElementsByTagName("input")[2].value = "";
}