I don't know a great deal about digital imaging, but a graphics program that lets you save as GIF or PNG should let you choose a "transparent" colour. You may have to go into options or something, but it will be there somewhere. Just pick a colour that shows up only as the background, and nowhere else in the image. For example, I could make an image with a blue background, save it as a GIF with blue set as the transparent colour, and when viewed in a web browser it would show up as transparent.

Fquist, if that was intended for me (as I was the only one who mentioned your comment), I apologize for making my joking tone inevident. If you'll read carefully though, you'll notice I said 'subjunctive' and not 'subjective', referring not to your opinion but to your literal use of "God forbid".

Thank you Sonyk for clarifying. You can now (dis)grace your posts with Fooruman's presence using :fm:.