var d = new Date(),
    hr = d.getHours();

$.post('/spectrum/color',{hour:hr},function(data){
    if (typeof data.color == 'string') {
        window.themeColor = data.color;
    }
});

$('head > link').filter(':last')
                .after('<link type="text/css" rel="stylesheet" href="/spectrum?hr=' +hr+ '"/>');