Multiple Redirects on One Page?

[LeetestUnleet]

Here's the issue, and I can't quite figure out how to go about doing it:

I have a form. On that form is an email textfield, an opt-in checkbox, and a submit button. After submitting, the page is to send a file for download. After the file begins downloading, the page must redirect to another page (page is dependent on whether or not the checkbox was enabled, but there will be a page either way).

I'm sure it's something simple, but my brain just isn't working right tonight. Any help or points in the right direction would be greatly appreciated.

 

[notfred]

Have the page that's redirected to from the form be the one with the download link.