function ShowCopyright() {
	var now = new Date();
	var year = now.getFullYear();
	document.write("Copyright © 1998-"+year);
}

function ShowLastMod() {
	var modified = new Date(document.lastModified);
	var year = modified.getFullYear();
	var month= modified.getMonth() + 1;
	var date = modified.getDate();
	document.write("最終更新日：" + year + "年" + month + "月" + date + "日");
}