Something like this on Apache:

<VirtualHost *>
    ServerName yourserver.org
    DocumentRoot /path/to/webinterface/www
    CustomLog /var/log/apache/access_chessd.log combined
    ErrorLog /var/log/apache/error.log
    ScriptAlias /cgi-bin/ /home2/chessd/www/cgi-bin/
    RewriteEngine on
    RewriteCond %{REQUEST_FILENAME} !-F
    RewriteRule ^/users(/([^/]+)(/([^/]+)/?|/?)|/?)$ /user/index.php?username=$2&action=$4&%{QUERY_STRING}
</VirtualHost>

and edit include/connect.php .