Search terms not being retained when returning to the results page

The old DA search used to create a session that was retained whenever the user returned to the results page, ensuring the user didn't have to reenter the search term.

I did ask in a different thread sometime back, but I've been a bit busy and thought I'd create a new thread. Basically, you said it should still retain the search terms when a user returns to the results page, but mine isn't. Ordinarily, I would enable a user to manually kill the session in order to display all results again, but it's automatically displaying all.

So, how can I overcome this issue?

I've attached the results page with the search form in it. I have added @session_start(), but it didn't do anything.

Thanks.