url not found

http://www.joomlawebsitesbyjim.com/wordpress/sample-used-car-dealer/ displays records from the database ….. works fine.

http://www.joomlawebsitesbyjim.com/wordpress/edit-car/
pulls the data out for edit ….. works fine.

On the edit page, when the submit button is clicked, (form action is update_car.php located in the same folder) I get URL Not Found.

By the looks of the Url: (http://www.joomlawebsitesbyjim.com/wordpress/edit-car/update_car.php) it’s appending update_car to edit_car.

Do I simply move update_car to it’s own folder?