jQuery - $Post / $Get - Standalone Input Box to post to outside URL

Look at the book now input box found on this website - [login to view URL] When someone fills in the dates and - it's posting to another URL like this - [login to view URL] I bought a new WordPress theme - [login to view URL] - I want you to customize the reservation input box on this new theme to work like this one [login to view URL] and post properly to [login to view URL] with all of the correct variables. Max $30 -