Install wireless without cable connection

[G.]

I currently have 10.10 installed.  I plan to dual boot with 11.04 (to
test it on my system).  However, I do not have cable internet access,
only wireless so I won't have internet access on my Dell mini 10
(Broadcom 43xx).  Is there a way to install the broadcom adapter
firmware without a cable connection?

thanks

gary