When I installed Linux Mint 14 on my Dell E6400 Latitude laptop, the Wireless driver was not installed by default. It seems lot of devices with Broadcom chipsets have this problem in linux.
On Mint 14, I tried mintwifi , but that did not work as expected.
I had the option to connect to internet using wired connection, hence I could install the driver using the following command.
If you do not have internet, you can still install by following the steps provided in the link below.