[enuddleyarbl]

In my case, I'm mostly worried about what happens if I delete those ids. So far, I've had no problem deleting every id= thing I've found. Usually, those are just for TOC types of things. But, after ripping everything out of the files and putting the proper <h1> and <h2> tags where I need them, I have the Calibre Editor recreate the toc.ncx file and then have it create an inline TOC from that. I then replace the book's inline TOC with the Calibre generated one. Again, no problems yet.

Of course, some of the silly HTML I think I'm seeing does bother me and I do wish publishers would be a bit more reasonable in what they put in there. But, then again, I also wish they'd read and correct the resulting books after they OCR scan them to a digital format.