Hmm, never thought of nested tags. Yah I can see where that would burn you if you don't pay attention or do a blind find/replace all. Something I very quickly learned NOT to do unless I am absolutely positive it will be ok.
Thanks for the heads up, so far I haven't had any nested tags in the books I've recently been fixing up but I do know I have some books that do have them that I will be fixing.
Always learning something here