BBCode IMG Edit

[TYorke]

Basically, what the title says. How do I edit the contents of this tag? I'd like to edit it so that the images are resized. That way, images won't extend and throw my forums out of alignment.

Also, I'd like to be able to 'rotate/switch' the alignment of the images. By that I mean, have it switch between left alignment or right alignment on every post.

Any geniuses here want to tackle this one for me?

Thanks