function now_key(){
	myD       = new Date();
	myYear    = myD.getYear();
	myYear4   = (myYear < 2000) ? myYear+1900 : myYear;
	myMonth   = keta(myD.getMonth() + 1);
	myDate    = keta(myD.getDate());
	myHours   = keta(myD.getHours());
	myMinutes = keta(myD.getMinutes());
	mySeconds = keta(myD.getSeconds());
	date_time = myYear4+myMonth+myDate+"_"+myHours+myMinutes+mySeconds;
	return(date_time);
}
function keta(num){
	ret = (num<10) ? "0"+num : num+"";
	return(ret);
}