Adding a second author's byline (or collaborator) on a specific post

Hi,

First of all, thanks for this theme. I'm using atahualpa 3.5.2 with wordpress 3.0. For the most part it has been great and I've loved how customizable it is.

That said, I'm still learning some of the more technical aspects of working with my site, so some of my questions might be a tad remedial. Still, I've searched both this forum and the wider web for a solution to the following problem, so far to no avail that I seem capable of implementing.

Here's the situation in a nutshell: For nearly all of the posts on my site I'm the only one who needs to be listed on the byline. However, I'm about to post a major piece where I was the writer and collaborated with a photographer. She really deserves credit equal to mine. I'd like to have the byline on that post, and only that post, read something along the lines of "Words by me, photos by her."

One idea I had was to use the advice in this thread to remove the byline from that specific post and just put the byline at the top of the text itself (which, because of the nature of the post, might work well for styling purposes). However, I'd be happy to just have the two author sort of byline.

Frankly, I couldn't follow the advice in the thread I just linked to. I tried to, but I'm not sure completely clear where the PHP code goes. I attempted the post info items, but that didn't seem to make a difference. I could of course easily be missing something, but I'd love a fairly clear, step by step on this idea if someone has one.

Thanks. I'd be happy to answer any more specific questions.