All you do is install this app. onto your Fanpage, create whatever you want "non fans" to see in Wordpress and drop the html code into the "NONFANS" box. (Make sure you have a request that they click "LIKE" to reveal whatever it is you want them to see.)
Do the same with fans. Create the text or graphics in Wordpress, convert to html code and drop it in the "FANS" box. Hit update and you are off and running.
Static HTML: iframe tabs | Facebook