function toggle_aside(elt) {
  if (document.getElementById) {
    style = document.getElementById(elt).style;
  } else if (document.all) {
    style = document.all[elt].style;
  } else {
    alert('Sorry, this link does not work in your browser.');
    return;
  }

  if (style.display != 'block') {
    style.display = 'block';
  } else {
    style.display = 'none';
  }
}