function show(menu) {
 showhide = 0;
 if(document.getElementById) {
  document.getElementById(menu).style.visibility = "visible";
  return true;
 }
 if(document.layers) {
  document.layers[menu].style.visibility = "visible";
  return true;
 }
 if(document.all) {
  alert("all");
  document.all[menu].style.visibility = "visible";
  return true;
 }
}

function hide(menu) {
 if(document.getElementById) {
  document.getElementById(menu).style.visibility = "hidden";
  return true;
 }
 if(document.layers) {
  document.layers[menu].style.visibility = "hidden";
  return true;
 }
 if(document.all) {
  document.all[menu].style.visibility = "hidden";
  return true;
 }
}