function getCSS(){
datetoday = new Date();
timenow=datetoday.getTime();
datetoday.setTime(timenow);
thehour = datetoday.getHours();

if (thehour > 20)
display = "/css/twilight.css?1";
else if (thehour > 17)
display = "/css/sunset.css";
else if (thehour > 14)
display = "/css/afternoon.css";
else if (thehour > 11)
display = "/css/noon.css";
else if (thehour > 7)
display = "/css/morning.css";
else if (thehour > 4)
display = "css/sunrise.css";
else if (thehour > 1)
display = "/css/twilight.css";
else
display = "/css/sunset.css";

var css = '<';  css+='link rel="stylesheet" href=' + display + ' \/';  css+='type="text' + '\/'; css+='css"';  css+='>';

document.write(css);
}