I agree 100% with Christina...secure the job first, and only disclose CF after the fact, and even then, on a need to know basis.
A couple of my co-workers I am close to know about my CF, but my boss still doesn't know (my old boss did though). He just knows I have to go to the doctor a lot, but I use my vacation/choice time days to do so, so it's not a big deal to him. It really just depends on the kind of working relationship you have with your boss and co-workers.
Definitely would not disclose it during the interview process though, as I'm sure they would find "some other reason" not to hire you.
Good luck job hunting!! <img src="i/expressions/face-icon-small-smile.gif" border="0">