now_time = new Date();
now_hour = now_time.getHours();

if (now_hour < 6) {
 document.write('<bgsound loop="-1" src="sound/thema.mp3" volume="-500">')}
else if (now_hour < 8) {
 document.write('<bgsound loop="0" src="sound/r1.mp3" volume="-1800">')}
else if (now_hour <= 23) {
 document.write('<bgsound loop="-1" src="sound/thema.mp3" volume="-500">')}