Hi,
try this:
create a form with the following structure:
Page (flow subform)
Page1SubForm (presence is visible)
Page2SubForm (presence is hidden)
Page3SubForm (presence is hidden)
...
Then, through some event, such as a click event on a button use the following script:
Page2SubForm.presence = "visible";
Page1SubForm.presence = "hidden";
there are plenty of of samples here.
check out:
Program Files\Adobe\Designer\EN\Samples\E-Ticket