A conditional response.expires with the back button

[wrbodine]

I have a page that, when sumbitted, redirects to another page and displays some of the info they entered so they can print it out. I added the code to the first page with response.expires so the page will expire when the click on the back button. This works great for when they submit the page normally.

Is there any way I can have the page not expire when they click the back button in cases where they didn't actually submit the form yet? An example would be when they were starting to fill out the form, checked their e-mail and clicked a link from an e-mail message that brought up the same browser, and then just wanted to click the back button and keep working on the form.

So basically I only want the page to expire when they click the back button coming from one specific page. Is there a way to track what page the user is coming from when they click the back button?

Thanks,
Ray