INVISIBLE Facebook Proxy (PHP)

I need a PHP proxy that will imitate Facebook exactly - it must remain transparent (URL, everything) so that it can be used in an internal network as if it were [login to view URL] itself.. For example: Bob types "[login to view URL]" into firefox, the DNS server returns a private server IP for [login to view URL], which is actually a proxy. This proxy will pretend to be [login to view URL], by imitating titles, urls, cookies, etc. I'm looking to do this with a stripped down version of PHProxy: [login to view URL] Looking for a cheaper bid as all I'm expecting you to do is modify an existing proxy script, not code one yourself.