datetoday = new Date();
	timenow=datetoday.getTime();
	datetoday.setTime(timenow);
	thehour = datetoday.getHours();
	
	if (thehour >= 23) 
		display = "f-all/structure-n.css";
	else if (thehour >= 19) 
		display = "f-all/structure-e.css";
	else if (thehour >= 10) 
		display = "f-all/structure-d.css";
	else if (thehour >= 4) 
		display = "f-all/structure-m.css";
	else if (thehour >= 0) 
		display = "f-all/structure-n.css";
	else 
		display = "f-all/structure-d.css";
	
	var css = '<';
	css+='link rel="stylesheet" id="select" href=' + display + ' \/';
	css+='>';
	
	document.write(css);