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

I have a website, [login to view URL] 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. I need three, simple, fixes to the website that I do not have time to complete myself. First - validate the user input and clean it for entry in to the database for registration, update info and contact us page, Second - on the contact us page, add a simple captcha to stop the bots from emailing me, Third - Stop the session from timing out. may use occasional behind the scenes AJAX call. Do NOT want simple change of cookie life, my website breaks without javascript turned on, so I would like to use AJAX or some other more durable method to maintain Session state. Could give a javascript pop up stating going to timeout also. I leave the particular solutions to the programmer, but before implemented, I must approve prior to accepting the bid. Please give detailed explanation of solution in your bid. You can log in and see examples of the pages listed. username = tester password = tester123 under My Courses tab you can see the course/test system that is causing the time out issue. I look forward to working with workers on the Freelancer site for many more projects in the future.