merge changes on oacs-5-1 branch to head, changes between jcd-merge-20040420 and jcd-merge-5-1-20040517 were merged, head pre changes is jcd-merge-pre-20040517 and post is jcd-merge-post-20040517
ad_form forms can be not completed, particularly if the target is not the same page that has the form. Reverting change to throw error. People are on their own now.