Session confusion :-(

Hi All I am send variable values via set links i.e.: http://domian_name.com/page.php?category=1 http://domian_name.com/page.php?category=2 http://domian_name.com/page.php?category=3 Etc etc The value is sent to a session. THIS WORKS BUT..... If I click on the first link session variable category is set to 1. But if I then click on the send , third, forth or whatever link Session variable is still set to 1. I have tried If(ISSET($category)){ Unset($category); Session_register(category) // hoping it would accept the new sent value. } No Go Can anyone throw some light on this please. As Always I am grateful for any pointers or exampled help :-) Dave Carrera Php / MySql Development Web Design Site Marketing http://www.davecarrera.com