Need help with something simple!

[bigray]

I made a login and stuff on my page, this is how i want it whenever someone clicks a link on my page pop-ups well come up if their not a registered user so they have to sign up to look at the page then when they sign up and login then when they go to a page they don't get the pop-ups and the page well show how can i do this in php?

[bigray]

How can you do that with .htaccess to so if your not a member on everypage you go pop-ups well come up until u register?