Basic Zoom Hack That Work for Several Games?

Is there any program that can zoom in/out with a button-press that would work for several FPS games?

This would be great; I haven't been able to find a simple PC zoom hack.

i tried using a program called Glassbrick which had a lot of costumisation but it doesnt zoom on the center. it would be great if someone could mod it to zoom on the crosshairs or something

Your help is much appreciated.