function toggleFold(sender, id) {
  var elm = document.getElementById(id);
  if (elm.style.display == "none") {
    elm.style.display = "block";
    sender.className = "unfolded";
  } else {
    elm.style.display = "none";
    sender.className = "folded";
  }
}

function toggleFold2(sender, id) {
  var elm = document.getElementById(id);
  if (elm.style.display == "none") {
    elm.style.display = "block";
  } else {
    elm.style.display = "none";
  }
}