Music player swf sound preloaders

[yoyong]

I'm trying to make a music player for my site, i have a main.swf
6 preloader swf and 6 attachsound tracks swf. They load fine , I made a cancel button to unload previous loaded movies. But when I choose to cancel loading a movie and choose other track it stops . I already tried putting tracks to same and diff levels. same thing to my preloaders. whichever way I can't seem to fix it.
eg.


call preloaders:
1.
loadMovieNum("mload1.swf", 11);
2.
loadMovieNum("mload2.swf", 13);
3.
loadMovieNum("mload2.swf", 15);

call tracks:

(track 1 - level 12 , track 3 -level 14)
track2. :

onClipEvent (load) {
loadMovieNum("track2.swf", 14, "POST");
loadBar._xscale = 0;
}
onClipEvent (enterFrame) {
var total = _level14.getBytesTotal();
var loaded = _level14.getBytesLoaded();
percent = (loaded/total)*100;
loadBar._xscale = percent;
percentDisplay = Math.round(percent)+"%";
if (loaded == total) {
_level14._visible = true;
_visible = false;
} else {
_level14._visible = false;
_visible = true;
}
}