function hideArea(object)  {
  if (document.getElementById && document.getElementById(object) != null)  {
      document.getElementById(object).style.visibility='hidden';
      document.getElementById(object).style.display='none';
  }
  else if (document.layers && document.layers[object] != null)  {
      document.layers[object].visibility = 'hidden';
  }
  else if (document.all)  {
      document.all[object].style.visibility = 'hidden';
  }
}

function showArea(object)  {
  if (document.getElementById && document.getElementById(object) != null)  {
      document.getElementById(object).style.visibility='visible';
      document.getElementById(object).style.display='block';
  }
  else if (document.layers && document.layers[object] != null)  {
      document.layers[object].visibility = 'visible';
  }
  else if (document.all)  {
      document.all[object].style.visibility = 'visible';
  }
}