2 minor fixes for your .mhp Allen:
cp_styles.cgi - top_thread detop_thread
Needs a space after "detop_thread" or you will get an error when trying to update your Style Template.
cp_vars_style_core.pl - Just a minor correction, in the detop addition, the first time it's called on it's refered to as top_thread, should read detop_thread, otherwise it will show up incorrectly in your Styles Template page.