facebook like plugin redirect

Hey,

How to add a facebook like box/button plugin that would redirect to a another URL after clicking. When a user comes to my website he would click a like button/box for a discount (which ever works) and then be redirected to another URL where the discount would be. please help

This one would be perfect for that: http://www.socialmediamarketingplan.org/

Maybe some one have free ??

It looks nice script.