function toggleDiv(id) {
  change = document.getElementById(id);
  anchor = document.getElementById(id + '-link');
  if (change.style.display == 'none') {
    change.style.display = 'block';
    anchor.className = 'list-dn';
  } else {
    change.style.display = 'none';
    anchor.className = 'list-rt';
  }
}