ecco :

codice:
                                	( tra <head> e </head> )

<script LANGUAGE="JavaScript">

<!-- Begin
songNum = new Array();
songNum[0] = "#";
songNum[1] = "midi/imagine.mid";
songNum[2] = "midi/whowant.mid";
songNum[3] = "midi/sweetheart.mid";
songNum[4] = "midi/yesterday.mid";

var music = null;
var track = 0;
var ver = navigator.appName;
function audioCheck(plugName) {
for (var i = 0; i < navigator.plugins.length; i++) {
if (navigator.plugins[i].name.toLowerCase() == plugName.toLowerCase()) {
for (var j = 0; j < navigator.plugins[i].length; j++) {
if (navigator.plugins[i][j].enabledPlugin) {
return true;
   }
}
return false;
   }
}
return false;
}
function chooseSong(s) { // ie
track = s.options[s.selectedIndex].value; 
if (ver == "Microsoft Internet Explorer") {
document.all.music.src = songNum[track]; 
} else {
songPlay('play');
   }
}
function songPlay(cmd) { // netscape
if (audioCheck("LiveAudio")) {
if (cmd == 'play') {
document.musicSource.play(false, songNum[track]);
   }
} else {
alert("Non hai i plugins necessari!");
   }
}
//  End -->
</script>




			SECONDA FASE

                                	( tra <body> e </body> )

<form name="choose">
  <div align="center"><center>

<select size="1" name="track" onChange="chooseSong(this);">
    <option value="0">Scegli la tua musica</option>
    <option value="1">Imagine</option>
    <option value="2">Who want to live forever</option>
    <option value="3">Sweetheart</option>
    <option value="4">Yestarday</option>
  </select> </p>
  </center></div>
</form>
<script language="JavaScript">
<!-- Begin
var ver = navigator.appName;
if (ver == "Microsoft Internet Explorer") {
document.write('<bgsound src="#" ID=music loop=1 AUTOSTART=true>');
} else {
document.write('<embed type="audio/midi" src="imagine.mid" AUTOSTART=false hidden=true VOLUME="90" name="musicSource" MASTERSOUND></EMBED>');
}
// End -->
</script>