Quickform_Controller - jump from page 1 to page 3

Hi, I don't quite get the way things work in the controller. What i want to do is the following, on a three pages form i sometimes need to go from page 1 to page 3. I suspect the jump action is involved somehow but i'm confused how to use it. To be more precise the redirect occurs on page 2 when certain condition are met (e.g: you choose NO on page 1, that means that page 2 will check and if it finds NO it will redirect to page 3. Arnaud.