Music plays on pc but not when uploaded

Thank you for your assistance.
I am new to Flash and my first project has been to build a simple ‘mp3 player’ in Flash8 that plays a song when the website is loaded with a button that will either stop or start the music depending on whether it is playing or not when the mouse is released.
This seems to work fine when I test it on my machine…even when I import the swf file and play it through Dreamweaver but when I upload it to the net, the music doesn’t play.
This is a test page of the website with the flash player:http://www.marcogalli.net/index2.html

This is the actionscript code I have in the file.

var musicPlays:Boolean = false;
var loopTune:Sound = new Sound();
loopTune.onLoad = function(success:Boolean) {
if (success) {
loopTune.start(0, 999);
musicPlays = true;
_root.gotoAndStop("playing");
}
};
loopTune.loadSound("cooltune.mp3", false);
musicPlayer.playStop.onPress = function ():Void {
if (musicPlays) {
this.gotoAndStop("stopped");
loopTune.stop();
musicPlays = false;
} else {
this.gotoAndStop("playing");
loopTune.start(0, 999);
musicPlays = true;
}
};

Am I missing something obvious???
Thanking you in anticipation =)