Cannot update record

Cannot update record

I've a problem in my php web pages when i enter the ID into searchbox &
press enter it displays the record from mysql database, & there is a
button to edit that record on that page, when i press that button it edit
the data into next form by sending id to next page via link, but the
problem here is that when i press back button in the browser to visit the
previous page it does'nt reload it & displays an error written
below>>>>>if you ever experianced such an error then please friends help
me out to fix it..???
ERROR DESCRIPTION:
"Document Expired, "This document is no longer available." "The requested
document is not available in Firefox's cache.As a security precaution,
Firefox does not automatically re-request sensitive documents.Click Try
Again to re-request the document from the website." "To display this page,
Firefox must send information that will repeat any action (such as a
search or order confirmation) that was performed earlier."