Sound problem when switching frame

[Icehowl]

This could be pretty hard to explain. I'm making a RPG and got stuck on a sound problem.

I have 3 frames. Frame 1 is a map (where the character walks around). Frame 2 is also a map (but a diffrent place). Frame 3 is a battle scene. Frame 1 & 2 share the same music frame while the battle scene ha one of its own.

http://img146.imageshack.us/my.php?image=picev6.jpg

When ever a random battle occurs, the map music will stop, the scene changes and a diffrent music starts. After the battle you'll go back to the scene you were on before the battle and the normal music (name of sound is "mysound") will restart. However if the battle takes place on map 2 (frame 2) the music wont restart since it's shared with the first frame (see picture above). I have already thought of giving each frame its own music frame, but that wont do, since I dont want the music to restart if you WALK from map1 to map2.

So my question is: Is there any way to check if a certain music file is already playing (the thought was that if a music file is already playing it will just keep doing so, If not it will just restart the the music) or anyother sollutions?

Somebody gave me a tip to do something like this:

Frame1:
var snd = new Sound();
snd.attachSound("mysound");
_root.snd.start(0, 99);

Frame2:
if (mySoundObj1.IsPlaying())
//do nothing
if (!mySoundObj1.IsPlaying())
_root.snd.start(0, 99);

But this doesn't seem to work. Do any of you see any errors in this code or have a diffrent sollution? I have asked around on diffrent forums, but non of their members replied.