Upgrade video card on macbook pro?

Hi everyone. My question is, is there a way to upgrade video card on macbook pro. I heard that they are integrated into logic board. Is it possible to extract one and insert another????|||Sounds like a question for a mac genius. Try going to an apple store and asking them. I know the majority of macbooks pros have at least a 128mb, but some of the higher end ones now have 256mb video cards.