Hi Aaron
When you mentioned navigate to the next page, I presume that the browser goes to new URL. And the way that you pass information from the first to the next page is via URL parameter values. If my assumption is right then you should be able to navigation back to the first page using URL parameters too.
If you are talking about using browser's back button to navigation back to first page, then you can use libraries like jquery-bbq to help you.
Thanks
-D