FLEXIBLE GUESTBOOK is a simple but powerful guestbook script in PHP/MySQL that can be used on personal or commercial websites. The salient features of this script are: 1. Easy and hassle free installation procedure. 2. Runs on any server with PHP and MySQL installed. 3. One script can be used for an infinite (space permitted) number of guestbooks. 4. No changing of CSS or style, it merges into the style of the parent page. 5. Email validation script embedded for better security.