After some poking around, I got rid of them. I'll post it
here for anyone that's curious. (It may be documented elsewhere,
not sure).
I assumed that changing the LNG File would do what I was
looking for, but guess not. Changing the name
will modify the names of Book and Page, but just putting a
blank for them in the LNG File didn't get rid of the hovers for me.
Anyway, whthost.js is the file you'll modify, and all you're
doing is changing the alt's for Book and Page. These modifications
are done assuming the default names of "Book" and "Page".
Look for
sAltString="Page";
and change it to
sAltString="";
Then look for
<img alt=\"Book\"
and change it to
<img alt=\"\"
Then the Book and Page graphics won't have the tooltip hovers
anymore. Save whthost.js somewhere else so you can copy it to where
you need it if RoboHelp overwrites it when you generate /
publish.