Hi LabOwner
Captivate SWF playback controls offer a mute button. Or if
for some reason you aren't using these, you may visit fellow Adobe
Community Expert Paul Dewhurst's site at
this
link and acquire a widget that should work. I do believe Paul
asks for a small donation in order to be able to download things
like this. But if you need it, trust me, it's worth it 100 times
over! Besides, think how good you will feel getting to help a
fellow human!
Cheers... Rick