function show() {
  var args = show.arguments;
  for (var i=0; i<(args.length); i++) {
    if (document.layers) {
      if (document.layers[args[i]]) document.layers[args[i]].visibility = 'visible';
    } else if (document.all) {
      if (document.all[args[i]]) document.all[args[i]].style.visibility = 'visible';
    }
  }
}
function hide() {
  var args = hide.arguments;
  for (var i=0; i<(args.length); i++) {
    if (document.layers) {
      if (document.layers[args[i]]) document.layers[args[i]].visibility = 'hidden';
    } else if (document.all) {
      if (document.all[args[i]]) document.all[args[i]].style.visibility = 'hidden';
    }
  }
}