Can I upgrade my video card on my Laptop?

I know alot about pcs Ive personally built about 3 gaming systems from the ground up. I dont know anything about laptops. I was wondering if it is possible to upgrade my Compaq EVO N610C laptop. It has an ATI Mobility Radeon 7500 Graphics Controller with 32 MB of DDR video RAM. But i'm not sure if its agp or pci or what? Can someone tell me anything that would help? TTHANX?