Hi, I saw your mockup and it's a very simple thing that you want.
I have 13 years as profissional web developer, tons of works done, many open-source contributions (check my GitHub: [login to view URL]). I have worked with PHP (12 years) and Rails (2 years). I've done several custom script modifications as a freelancer in this time.
I will charge you only US$ 25 regardless of how much time it takes. And you will only pay me if you like the result - I don't really care about the money, I'm interested in the XP and the review (as I'm new here in freelancer.com).