Solving the internal server error when viewing the site guestbook

In the guestbook.module file, line 265 needs to be changed to make the guestbook work without mod_rewrite (clean urls)

This is that line:

$output .= "<br /><div class=node><div class=title>&raquo; <a href=\"guestbook/0\">"

It should be changed to this to make it work without support for clean urls:

$output .= "<br /><div class=node><div class=title>&raquo; <a href=\"?q=guestbook/0\">"

Thanks.