If there's no linux driver, then you have 2 options (just like me, since I have an HP ze5470 laptop - broadcom wireless card).
1.) Do some research on ndiswrapper (which uses your windows broadcom .sys and .inf files) for free and can be difficult for a newbie to setup.
2.) go to www.linuxant.com
and download the trial for 30 days, if you get it working then spend the $20 for a lifetime key which is specific to that laptop. This also uses your windows .inf and .sys drivers.