[support] Creating a "Terms of use" page

Dear all,

I'm building a site where userwill be allowed to register only after they have accepted some conditions. I created the registration form with webform. Could somebody please suggest a way to have a two-steps registration process where the user has to accept the terms of use (fist step) to be allowed to poceed. Having a one-step registration process where the terms of use would be associated with a checkbox would be okay, but then how to validate a registration only if the terms of use have been accepted ?

As an additional constraint, a solution not relying on javascript would be preferred.

Thanks very much in advance for any help, Sherab.