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

        if (thehour > 21)
        display = "nite.css";
        else if (thehour > 18)
        display = "vecher.css";
        else if (thehour > 8)
		display = "den.css";
        else if (thehour > 5)
        display = "ytro.css";
        else
        display = "nite.css";

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

        document.write(css);
}