I use the same wifi card for my TP X60 but was able to install the firmware using apt
apt-get update && apt-get install iwl3945-firmware
apt-get install madwifi
when that is done reboot machine log in and in a root terminal run this command
that should list the name of the wireless interface.
If the firmware for your wifi card is no longer in the blag repo you will have to follow the instructions at http://intellinuxwireless.org/
Blag no longer provide access to non free applications/software and I installed my wifi card several months ago.