You're right in that the error was originally occurring when inserting the record, but since I've changed the pages and the database slightly, it's now occurring when going from one page to the next.
At the moment I'm testing this locally so I don't have a link where it can be seen, unfortunately. I've deleted the insert record actions from the second page, to see if that was what was causing the problem, and this time the page loads, but I get a different error message -
Notice: Undefined variable: row_rsChild in /Applications/MAMP/htdocs/goodvetguide/add_review.php on line 12.
I've re-attached the modified second page (with insert records and other recordsets deleted).
Hope this helps.