D'oh! 
That was too obvious. Hang on a second while I try again...
How cool is THAT???
Regarding your comment about highlighting non-adverbs, you're right--that's step 2. I have a list of the most common nouns and verbs that end in -ly, so my plan was to create an array containing all of them (about 50), have the macro search for them, and unhighlight any that it finds. Is there a smarter way to do that?
Thanks!