The forums on our site are to be used for the purpose of getting applications to run with CrossOver and getting them to run better with CrossOver. Questions like this may often be ignored as they should be asked on a 'how-to' forum about the application in question.
That being said, you should be able to remove your sound layer from your button. Essentially the opposite of creating a sound layer:
http://www.trainstation.cc/Tutorials/Flash/create-button.html
Or, you should be able to select or omit the sound feature opposite the details here:
http://www.tutorialized.com/view/tutorial/rollOver-sound-button/22993
Or perhaps this would be of help:
http://www.webdesignerforum.co.uk/index.php?showtopic=10132
Final suggestion is to choose a site with a decent forum response regarding questions on Dreamweaver 8 and ask your question there. I would not suggest the forums on adobe's site as it seems mentioning using Flash for buttons will quickly get you flamed. But the forums at http://www.webdesignerforum.co.uk seem to be well responded to... the search feature is a bit klunky, but the answers seem quite helpful and thorough and the community seems very friendly even to beginners (which is not a common feature on some sites).