function AnswersShowHide(antwort, nr) {
  var frageId = "frage_"+nr;
  var pfeilId = "pfeil_"+nr;
  
  if(document.getElementById(antwort).style.display == "none") {
    var oldSource = document.getElementById(pfeilId).src;
    var newSource = oldSource.replace(/pfeil_rechts/, "pfeil_unten");
    document.getElementById(pfeilId).src = newSource; 
    document.getElementById(antwort).style.display = "block";
    document.getElementById(frageId).className = "textblaubold";
  }
  else {
    var oldSource = document.getElementById(pfeilId).src;
    var newSource = oldSource.replace(/pfeil_unten/, "pfeil_rechts");
    document.getElementById(pfeilId).src = newSource; 
    document.getElementById(antwort).style.display = "none";
    document.getElementById(frageId).className = "";
  }
}