You cannot pass a parameter in an includes, or require statement. Drop the session ID from the url. Just go ahead and include the file without it. As long as you have used session_start() either before the includes, or from the included page, the session ID should still be accessable from the included files.
You only need to append the session ID to urls, and form actions. The included files are actually part of the script that calls them, so they have access to the ID just like the calling script.