function foldAll() {
   for (inr=1; inr<=8; inr++) {
      document.getElementById("fold" + inr).style.display = 'none';
   }
}

function unfold(nr) {
   element = document.getElementById("fold" + nr);
   parentEl = document.getElementById("parent" + nr);
   statusEl = element.style.display;
      for (inr=1; inr<=8; inr++) {
         document.getElementById("parent" + inr).setAttribute("class", "clickable");
         document.getElementById("fold" + inr).style.display = 'none';
      }
      if (statusEl == 'none') {
         element.style.display = 'block';
         parentEl.setAttribute("class", "clicked");
      }
}