Module links redirect out of the site

All modules and links are redirecting me out of my site that don't is installed on root of the server because you are passing urls using a leading slash like "/guestbook".
I did several improvements to your module, like use of the the drupal form api, make it xhtml compilant , use l()s functions instead of <a> tags and improving drupal coding standards.
If you have interest in improve this module, please contact me for a patch.

Thank you.