How make mp3 player stop when moving to different pages

Hi, I new to Flash  and Action Script 3.0.  I've just designed my first Flash website (for a band), and one of the pages has an MP3 player on the audio page.  It plays fine, as long as you're on that page.  But the problem is, when you go to a different page in the website, it keeps playing, and then when you return to the audio page, a new instance of the song that's playing starts playing on top of the song that's already playing. It's a jumble of sound that can't be stopped unless you close out of the website.

How can I make the mp3 player stop when someone leaves the audio page?  I'd like the songs to just play on that one page, and then stop if someone clicks a tab for a different page. I hope if I paste the code for the player below, somebody (please!) can help.  Thank you.

var my_songs:XMLList;
var my_total:Number;

var my_sound:Sound;
var my_channel:SoundChannel;

var current_song:Number = 0;

var song_position:Number;
var song_paused:Boolean;

var myXMLLoader:URLLoader = new URLLoader();
myXMLLoader.load(new URLRequest("playlist.xml"));
myXMLLoader.addEventListener(Event.COMPLETE, processXML);

function processXML (e:Event):void{
var myXML:XML = new XML(e.target.data);

my_songs = myXML.SONG;
my_total = my_songs.length();

myXMLLoader.removeEventListener(Event.COMPLETE, processXML);
myXMLLoader = null;

}

function playSong(mySong:Number):void{
var myTitle = my_songs[mySong].@TITLE;
var myArtist = my_songs[mySong].@ARTIST;
var myURL = my_songs[mySong].@URL;

title_txt.text = myTitle;
artist_txt.text = myArtist;

if (my_channel){
my_channel.stop();
my_channel.removeEventListener(Event.SOUND_COMPLETE, onNext);
}

my_sound = new Sound();
my_sound.load(new URLRequest(myURL));
my_channel = my_sound.play();
my_channel.addEventListener(Event.SOUND_COMPLETE, onNext);
}

next_btn.addEventListener(MouseEvent.CLICK, onNext);
function onNext(e:Event):void{ //This used to have MouseEvent, change it to Event
current_song++;
if (current_song>=my_total){
current_song=0;
}
playSong(current_song);
}

prev_btn.addEventListener(MouseEvent.CLICK, onPrev);
function onPrev(e:MouseEvent):void{
current_song--;
if (current_song<0){
current_song = my_total-1;
}
playSong(current_song);
}

pause_btn.addEventListener(MouseEvent.CLICK, onPause);
function onPause(e:MouseEvent):void{
if (my_channel){
song_position = my_channel.position;
my_channel.stop();
song_paused=true;
}
}

play_btn.addEventListener(MouseEvent.CLICK, onPlay);
function onPlay(e:MouseEvent):void{
if (song_paused){
my_channel = my_sound.play(song_position);
song_paused=false;
} else if (!my_channel){
playSong(current_song);
}
}