function LastUpdateStr(){
	var now = new Date(document.lastModified);
	var yr  = now.getYear();
	var mn  = now.getMonth() + 1;
	var dt  = now.getDate();
	var dy  = now.getDay();

	var fyr = (yr < 1900) ? 1900 + yr : yr;

	document.write("最終更新日 : " + fyr + "/" + mn + "/" + dt );
}