WordPress.org

How do I customize the markup created by the current_book(); hook

The function current_book is defined within the bookdisplay.php file and can be manipulated there with a basic understanding of the PHP programming language.

Does this plugin work with all WordPress versions

Do to its simplicity the plugin should work for almost (if not) all versions of WordPress. It has been thoroughly tested in the current WordPress release (2.5). If you find a bug in any other versions of WordPress, please let me know so that I may fix them.