Form Posting

We have a website: [login to view URL] that has a "free gifts" page. Once a user has selected which country they are from we want them to fill out a form with all their details, first name, last name, dob, address details, email, phone and so on with error checking (ie valid DOB, and text entered in all fields). When the user presses the confirm button we then want the form to open two pages on one of our sponsor's web sites and auto fill out those forms with the details the user just entered (the sponsor forms are in german). You just need to do the work once and we'll copy it across for all the other pages.