Jeb is correct.
The only way to fix PHPSESSID= is to go into your
php.ini file, (LINUX /etc/php.ini)
Find the line that says...
session.use_trans_sid=1
and change it to...
session.use_trans_sid=0
Save file, reboot apache...
( /etc/rc.d/init.d/httpd restart )
Whalla.. you will now have transparent tracking.
Cheers,
John