var now = new Date();
var hours = now.getHours();
var psj=0;
document.write('<style type="text/css">')
// Von 06-18 Uhr Tag Blau
if (hours > 5 && hours < 18){
document.write('body{background: url(background/tag.jpg)}')
}
else {
// Von 18-6 Uhr Nacht Schwarz
document.write('body{background: url(background/nacht.jpg)}')
}
document.write('<\/style>')