This means that some content is only displayed when a User has already liked a Fanpage.
The Fan Gate will run when implemented in a iframe hosted on my webserver.
!!! WHAT I DO NOT WANT:
Already available free solutions that using an old and existing FACEBOOK FBML APP
(known as "Static HTML: iframe tabs" which i know is used by 45 Million Facebook pages already (TM) or solutions that are using the DEPRECIATED <fb:visible-to-connection>.
I can provide some google search querys that help you get started.