Search Results->Details Back Button

Hi,

I'm new to PHP so this will hopefully be a dumb question.

I'm using the FileMaker API for PHP. I've created a basic site using the Site Assitant. When you search the database you get the list of found records on the recordlist.php page. When you click to view an individual record details you go to browserecord.php. If you click the Back button in your web browser to logically go back to the list of search results instead of taking you back to your recordlist.php results page at you get the "Webpage has expired" error.

Is there a reason for this? How can I go from viewing a specific record back to the list of search results?

Thanks,

Steve