http://youtube.com/watch?v=thAVY-3Ye6g
as Matt said, once you peer behind the panel (which I think is quite easy to
remove) it should be apparent how to remove the switch. just a couople of
plastic tabs to press and carefully apply pressure. be careful not to force
too much or you'll risk fracturing the tabs.
if you need switches, I happen to have two which are off my 99 which I dont
need. (I replaced my E320 seats with those from E55 and which included
complete door panels.) can sell for $50 (+ $5 shipping) for both driver and pax
switches.
(
lazy...photo from Ebay)