How to do mp3 downloads in firefox?

I am using this code to set up mp3 downloads
-First Frame
mp3version="401audio.mp3"
-Then on the button
on (release) {
getURL(_root.mp3version,"_blank")
}

And this works correctly in ie but firefox plays the file, I dont want to put
instructions to change how firefox manages mp3 file types. Is there another way
to download mp3 files in flash.

here is the code for the correct way to download from flash - this comes
straight from the flash help:

import flash.net.FileReference;

var listener:Object = new Object();
listener.onComplete = function(file:FileReference) {
trace("onComplete : " + file.name);
}

var url:String =
"http://www.adobe.com/platform/whitepapers/platform_overview.pdf";
var fileRef:FileReference = new FileReference();
fileRef.addListener(listener);
fileRef.download(url, "FlashPlatform.pdf");

just change the the url string to the path of your file and change
FlashPlatform.pdf to the default name you want the file to be named when it is
downloaded.