Resources url at
http://www.gossamer-threads.com/scripts/resources/Detailed/92.html

quotes:

"Add Confirmation
This is a very simple mod to give end-users a chance to double-check their input before making an addition to the database. The zip file contains a slightly modified version of add.cgi, a new template for the confirmation screen, and a readme explaining three other small changes you will need to make to your files. Note that this mod was written for templates. It should be very easy to modify it for use with site_html.pl, but I haven't tried it myself.
Added: 2000-12-20
URL: http://www.asan.com/users/phoenix/addconfirm.zip "

but the link is not found! Anyone have a copy of the zipped file?