function show(zap) {
  if (document.getElementById) {
    var abra = document.getElementById(zap).style;
    abra.display = "";
    return false;
  }
  return true;
}

function hide(zap) {
  if (document.getElementById) {
    var abra = document.getElementById(zap).style;
    abra.display = "none";
    return false;
  }
  return true;
}