Do they make gaming video cards for laptops?

I have a Sony VIAO laptop with 2 MB processor and 160 MB Hard Drive but I can't play some games on it because of my video card (eg. Civilization 4). Is there an external video card or something like that I can get so that I can play these types of games?|||no laptops can't be upgraded except ram,hard drive and dvd|||The video card your laptop came with stays with it. Normally it is soldered right to the mother board.