Flash Drop Down Menu Problem Using Flash pro 8)

I’m trying to duplicate a flash dropdown box I found on another website I like. I started it but can’t get the drop down action rollover command to work. I’ve attached my FLA. Also, how can I get the the button and drop down to turn transparent when the user rolls over the main button? Can someone please help me acheive the same navigation effect as on the following website…here is the link http://www.truedentistry.com/

Thank you