Shelly,
Check out the "Smart Top" module. I do not have one but others have successfully used them.
I did a quick search here (Pelican) and did not find it at first??? I just re-searched and Pelican lists them. Well DUH!
But you can still see the demo on this other site, Please support Pelican with your$$
http://www.pcars.com/porsche_parts/shop.php/porsche/carrera-2/4/turbo-996-/relays-motors-switches-wiper/smarttop-996-for-porsche-carrera-cab/p_2.html
SmartTOP 996 for Porsche Carrera Cab
Product Information
SmartTOP 996 is for all Carrera Cabriolets (Convertibles)
The smartTOP roof control unit allows opening or closing the convertible top while driving at slow speeds. It works similar to power-windows and opens or closes the roof automatically at the touch of a button. It is not necessary to stop the vehicle and pull the handbrake to operate the roof.
Plug and Play: easy installation in 15 minutes. No tools required.
No car mechanic help needed.