function calcfilename(){
	temp_date = new Date();
	month 	  = temp_date.getMonth();
	hours	  = temp_date.getHours();
	filename=""
	dark=20
	rise=6
	if( month >= 11 || month < 2 ) {
		filename="whinter";
		dark=18;
		rise=8;
	}else if( month < 5 ) {
		filename="spring";
		dark=20;
		rise=6;
	}else if( month < 8 ) {
		filename="summer";
		dark=22;
		rise=5;
	}else if( month < 11 ) {
		filename="outhmn";
		dark=20;
		rise=6;
	}
	if( hours >= rise && hours <= dark ) {
		 filename = filename + "day";
	} else { filename = filename + "night";
	}
	return filename;
}