function showLastUpdate() {

if(navigator.userAgent.indexOf("Safari") != -1)
	return;
	
var now = new Date();
var prev = new Date();
var last = new Date();
var stamp = new Date(document.lastModified);
prev.setTime(now.getTime() - 12*60*60*1000);
if(prev.getTime() > stamp.getTime()) {
	last = prev;
}
else {
	last = stamp;
}
document.write("[最終更新日: ",last.getFullYear(),"/",last.getMonth()+1,"/",last.getDate(),"]");
}