How can I be sure that i have an agp slot?

I also have the similar problem.

I recently ordered a GeForce 6800 GT 256 MB agp version and im not sure if it will slot into my PC.

My motherboard (Athlon 64 processor 3000+) is fairly new and it has 5 pci slots but im not sure if I have an agp slot.

The reason im confused is that in the brown which I thought was an agp slot, I have a Radeon 9200 Series card, and according to the computer, its a pci card. So how can this be a agp slot?

If it is, my old card should not be working.

This is very confusing guys. Could you help me out!