function microfilm_formcheck(){
	var get_datetime_y = document.forms["microfilm"].elements["y"].value;
	var get_datetime_m = document.forms["microfilm"].elements["m"].value;
	var get_datetime_d = document.forms["microfilm"].elements["d"].value;
	var get_datetime_h = document.forms["microfilm"].elements["h"].value;
	
	var get_datetime = new Date(get_datetime_y,get_datetime_m-1,get_datetime_d,get_datetime_h,0,0);
	get_datetime.getTime();
	
	var limit_datetime_start = new Date(2008,12-1,1,0,0,0);
	limit_datetime_start.getTime();
	
	var limit_datetime = new Date();
	limit_datetime.setTime(limit_datetime -6*60*60*1000 -6*24*60*60*1000);
	var limit_datetime_y = limit_datetime.getFullYear();
	var limit_datetime_m = limit_datetime.getMonth();
	var limit_datetime_d = limit_datetime.getDate();
	var limit_datetime_end = new Date(limit_datetime_y,limit_datetime_m,limit_datetime_d,0,0,0)
	
	if(get_datetime < limit_datetime_start || get_datetime > limit_datetime_end){
		document.getElementById("microfilmerror").innerHTML = "[ERROR] 検索可能期間外です";
		return false;
	}
return true;
}