ActionScript 2.0 :: MP3Player - Variables And External Sources

I have an mp3player that loads an external mp3 file and plays. It works just fine if the url/location is hardcoded in the swf file. However, I need to be able to have the url passed to the flash externally so that a number of users may utilize this single swf build.

Example:
Current location need to be filename.mp3 or [URL]. However, I need this location to be edited per use of the swf. In php i know I could call it such as:
$myLocation = "123";
[URL]
or
$myLocation = "[URL]";
(The "123" is what changes for each page use)

Here is the code i have that is working just fine. Until I need to use a full url that changes for each page the swf is use on.
onClipEvent (load) {
if (playing!=true) {
playing=true;
soundIsLoaded=1
myMusic=new Sound();
myMusic.loadSound("myMusic.mp3",true)
}}

Limitations:
1. Because of the server set up, I am always required to call items using full absolute urls/paths.
2. php, cfm, xml etc are not available for use with this. -- the goal is to be able to give an webmaster a copy of the swf and the code to embed it on their html page... and that's it.