How to use game Assets?

Hello, I would like to ask which is the best way to set-up some Assets for use in games?

what I mean is that I have 10 pictures of a gun and I want to make a shooting game. So depending on the Mouse y-position, it should load a different picture to gun_mc, to make it Pseudo-3D.

One thought is to have all 10 pictures in the gun_mc in different frames and depending on Mouse y-position gotoAndStop in the most appropriate frame…

Is this the right way?
Any thoughts?

Thanx in advance,

Psilos