ben bu kodu arka fonda rastgele müzik çalmak için kullanıyordum

<script language="JavaScript">
//-- Generate a random number between 0 and max.
function randomNum(max) {
var rNum=NaN
while (isNaN(rNum)) {
rNum=Math.floor(Math.random()*(max))
}
return rNum
}

var sound = new Array()
sound[0]= "midi/hello.mid"
sound[1]= "midi/wakeup.mid"
sound[2]= "midi/stronger.mid"
sound[3]= "midi/fairy.mid"
sound[4]= "midi/space.mid"
sound[5]= "midi/you.mid"
sound[6]= "midi/getwell.mid"
sound[7]= "midi/scary8.mid"
sound[8]= "midi/boat.mid"
sound[9]= "midi/time.mid"
sound[10]= "midi/lane.mid"
sound[11]= "midi/watch.mid"
sound[12]= "midi/own.mid"
sound[13]= "midi/dreams.mid"
sound[14]= "midi/paint.mid"
sound[14]= "midi/maryjazz1.mid"
sound[14]= "midi/mary.mid"
</script>
<p align="center">

<script language="JavaScript">
soundFile=sound[randomNum(sound.length)]
//-- Decide whether to use embed or bgsound.
if (navigator.appName.indexOf('Microsoft')>=0) {
document.writeln ('<bgsound src="'+soundFile+'">')
}else{
document.writeln ('<embed src="'+soundFile+'" hidden=true autostart=true>')
}
</script>