How to add NIC driver

Hi,

I have the following network card in my PC

Broadcom Corporation NetXtreme BCM5782 Gigabit Ethernet (rev 03)

I have downloaded the latest bbc-2.1-with-sources.tar.gz and succesfully 
built and iso image and written a working bootable CD.

Unfortunatley the NIC is not configured during bootup as I think the NIC 
driver module is missing, I think the module is tg3.  So how can I add 
the required module to the BBC/GAR tree so that the NIC will be 
configured on bootup.  BTW we use DHCP here and I am running Redhat 
Enterprise Linux Workstation edition which is fully updated.

Thanks fo any help you can provide

Jimmy