ad_form_new_p
exists_and_not_null
if {![ad_form_new_p -key label_id]} { set page_title "Edit Label" } else { .... }
Jon has a rather extensive document on how to use ad_form at http://jongriffin.com/static/openacs/ad_form/using-ad-form.
I made this change, but it didn't have any effect.
I've looked at Jon's documentation and I still can't see where I'm going wrong.