[Request] Image Stacking

[uuilliam]

I've heard about image stacking on here, but how exactly do you do this?
can anyone refer me to a tutorial or make one (video or images please text tutorials prove not too helpful unless worded well)

Thanks in advance

[chrishoggy]

Here ya go:
http://www.youtube.com/watch?v=fJiEw4VCcYU