var n = 0;
var sequence = [];

function Next () {
  if (n >= sequence.length) return;
  var ids = sequence[n]; n++;
  if (typeof ids == 'string') {ids = [ids]}
  for (var i = 0; i < ids.length; i++) {
    var id = ids[i]; var img;
    if (typeof id == 'object') {img = id[1]; id = id[0]}
    var element = document.getElementById(id);
    if (element) {
      element.style.visibility = 'visible';
      if (img && element.src) {element.src = 'GIF/'+img}
    }
  }
  if (n >= sequence.length)
    {document.getElementById('Advance').src = 'GIF/next-flat.gif'}
}

document.writeln('<STYLE TYPE="text/css">');
document.writeln('  .hidden {visibility: hidden}');
document.writeln('</STYLE>');