datetoday = new Date();
timenow=datetoday.getTime();
datetoday.setTime(timenow);
thehour = datetoday.getHours();
var css = '<link rel="stylesheet" type="text/css" href="common/css/home_n.css" media="screen,print" />';
if (thehour >= 18 || thehour <= 4){document.write(css);}