function toggleBlock(id) {
  var e = document.getElementById(id);
  var up = document.getElementById(id+"_up");
  var dn = document.getElementById(id+"_dn");
  var on = document.getElementById(id+"_on");
  var off = document.getElementById(id+"_off");
  if (!e) return true;
  if (e.style.display == "block") {
    e.style.display = "none";
    if (dn) dn.style.display = "inline";
    if (up) up.style.display = "none";
    if (on) on.style.display = "none";
    if (off) off.style.display = "inline";
  } else {
    e.style.display = "block";
    if (dn) dn.style.display = "none";
    if (up) up.style.display = "inline";
    if (on) on.style.display = "inline";
    if (off) off.style.display = "none";
  }
  return true;
}