search results problem

Ok, here is the problem i am encountering. I have a search setup on the website www.prosalvage.com from the home page or from http://www.prosalvage.com/search.php

When you perform a search and go to the results page, and then click on any of the results everything works great. If you use the browser back button from the details page back to the search results you get Webpage has expired error page, if you hit refresh you get the results back. I have never seen this before.

any ideas

Webpage has expired Most likely cause:

• The local copy of this webpage is out of date, and the website requires that you download it again.

What you can try: [img]bullet.png[/img] Click on the Refresh button on the toolbar to reload the page. After refreshing, you might need to navigate to the specific webpage again, or re-enter information. Webpage has expired Most likely cause:

• The local copy of this webpage is out of date, and the website requires that you download it again.

What you can try: [img]bullet.png[/img] Click on the Refresh button on the toolbar to reload the page. After refreshing, you might need to navigate to the specific webpage again, or re-enter information.