Another f*** sound problem!

so…
first - the .swf works PERFECT!
I need a background sound, with on/off buttons. all workin’fine - it’s a movie.
when I put this movie in my flash site - on a separate layer, I had some problems with tha sound. Worked randomly - even if stopped, the sound started playin’ when I came from a frame to a previous one.
So, the solutions was: in Dreamweaver MX I have 2 .swf: the sound and the rest.
PROBLEM is: even if the sound runs, the button(movie) appears randomly. When appears, I can control the sound background, when not, the sounds plays allthe time!
so…
any idea appreciated!
tkx!