function hide(object) {
  if (document.getElementById) {
    document.getElementById(object).style.visibility = 'hidden';
  }
  else if (document.layers && document.layers[object]) {
    document.layers[object].visibility = 'hidden';
  }
  else if (document.all) {
    document.all[object].style.visibility = 'hidden';
  }
}

function show(object) {
  if (document.getElementById) {
    document.getElementById(object).style.visibility = 'visible';
  }
  else if (document.layers && document.layers[object]) {
    document.layers[object].visibility = 'visible';
  }
  else if (document.all) {
    document.all[object].style.visibility = 'visible';
  }
}