How to make visitors click "like us" for a FB page before viewing the content? Please read well?

[James]

I know how to create banners, clickable banners and know how to use Photoshop. What I need is something very specific... I see many FB pages have cute and professional banners that ask visitors to "like us" FIRST to view the page content. If the visitor doesn't lick the "like" button for the page, they can't view the content. Is there an application to do this on FB?
I want to know how to do that for my page. Also, I want to know if I can create a clickable banner and place it in my page that takes fans or visitors directly to my personal website or affiliate links to generate traffic and commissions. Any help?
@jon_mac_usa007: dishonest? you haven't a clue about marketing strategies. If I want to run a competition on my page and ask visitors to like the page to win something, you call it dishonest? I call it strong marketing tool to get traffic and advertise my services/products via Facebook. I didn't ask your opinion on what I need, I'm asking anyone who knows how to set that option on a FB page, if you don't know the answer, you can just pass my question. Why are you commenting to give me no answer just to get 2 points?? and you talk about honestly, lollllllllllllllll
@Vanessa, well yes, I want to use it for promotions, contests, is there an application on FB for that?