Sweet, permaguy. Many thanks. It works great in Firefox 5. Now I can follow 15-page threads without searching for where I left off. Again, Sweet. I'll have to see what other scripts are available for Grease Monkey.
I was leary of calling jquery.min.js from an unknown site, but it looked like a standard function on a legit site, so I took a chance. It may be deleting the files from c:\ right now, but the New Posts buttons work properly.