[Udpcast] embedding driver

Hi, The pre-build kernel for udpcast doesn't include driver for my network card hence all my pcs only boot up and can't accept ip address. How do I including the driver's .ko file in such a way that it is available for the kernel to use ? I tried the *files executables to be added to image* option in cast-o-matic, but that doesn't work. Please help! Thanks. Samar