AJAX/Jquery form validation and maintain session state and not timeout page while user takes long test. by nurse411

I have a website, www.Nurse411.com where users can login, update user info and then purchase and take online courses. The courses are lengthy to read and then they take a test. The website keeps losing session date (timing out) during the hour or more that the user is reading the material… (Budget: $30-$250 USD, Jobs: AJAX, HTML, jQuery / Prototype, PHP)