I have a inspron 6400 and I wanna upgrade my video card... is it possible?

I found out recently that my laptop won't run some really good games (like Battlefield 2 or Quake War ET) and it turns out that it needs a video card upgrade =\. So is it even possible 2 upgrade (cuz it is a laptop after all...) and how much will it cost me? I'm using mobile Intel 945gm express chipset. Plz help me!