update = new Date(document.lastModified);
theMonth = update.getMonth() + 1;
theDate = update.getDate();
theYear = update.getYear();
if (navigator.appName == "Netscape","Opera") {
   if (theYear >= 100) {
      theYear = theYear + 19l
      if (theYear < 10) {
         theYear = "0" + theYear
      }
   }
};
if (navigator.appName == "Microsoft Internet Explorer") {
      theYear = theYear - 1900
 };

document.writeln("<div id=\"date\">最終更新日: " + theYear + "/" + theMonth + "/" + theDate + "</div>")