Hi, if your going to get into lots of images needed and switching between them I would recommend using a directX component set. they are all very easy to use, and there are multiple ones available.

DelphiX
PowerDraw
Omega

I would recommend using one of them It makes things so much easier.

If you dont want to go that route, I Would just use an imagelist, they are easy to figure out with playing around with them a little

Im sure there are lots of ways to go about it.

Bobby