Include guestbook in my site - Help

I don't understand. I havent in mys site header and foot but I made a page called guestbook.php that i putted in the directory with all my other homepage files.
In the guestbook.php i used this code to include what i needed:
Code:
<?php include("guestbook/index.php"); ?>

and I open Open up the config.inc.php file in the amdin folder, Look for the base_url variable and set it but
It worked, but when i click on sign in the guestbook or something i just get page not avalible, i think its because the to files is in two diffent directorys?
Help

The guestbook wont work that way. You either need to edit the header and footer to match your site or take a look at Lazarus.