function Re_Day(){
myModify = document.lastModified;
myD = new Date(myModify);
myYear = myD.getYear();
myYear4 = (myYear < 2000) ? myYear+1900 : myYear;
myMonth = (""+(myD.getMonth() + 1 +100) ) .substring (1,3)  ; 
myDate = (""+(myD.getDate() +100) ) .substring (1,3) ; 
myStr = "最終更新日 " + myYear4 + "年" + myMonth + "月"  + myDate + "日" ;
document.write(myStr);
}