function writeModDate() {
  var modidate = new Date(document.lastModified);
  var modiyear = modidate.getYear() + 1900;
  if (modidate.getYear() > 1000) modiyear = modidate.getYear();
  document.write("Last modified on " +  (modidate.getMonth() + 1) + "/" + modidate.getDate() + "/" + modiyear);
}