simple session/cookie question

[bitHacker]

hi,
I have created a new page for my project, which display a list of entries from a db.

so far so good

My problem, is that each entry has a lot of fields (about 20), so I separated them to 2 templates (1 for 15 questions and 1 for 5), what I want to do, is to disable/notify/make sure
if the user hit the back button in the browser, to not resubmit his step, and creating a duplicate entry.

For example, step 1 - answerd all the questions ok, hit my "next" button on the page,
answerd other questions on second page, then hit "finish" button, and all data is stored in DB.

NOW, hit back button and press "finish" AGAIN ! <--- how do I prevent it ???

Thanks in advanced :up: