Used last year's program page as source for this year's, copied and pasted all the sessions in.
Adjusted the page http://web.uvic.ca/french/web_pages/grad_colloquium/index.php to make the entries for 2007, 2008 and 2009 consistent.
Noticed that the include files were not linking properly. Turned out that the variable ($level) was not registered with the session array, so I created a new variable $_SESSION['level'] in the URL above and in the files in the 2009 subfolder. Setting that var must happen after the include settings.php call for any page that is not in the root folder. The settings.php file sets the value of the variable to "", so files in the root folder need not address the variable. That variable is used in the files script_files/php/menu.php and script_files/php/settings.php to control how many directories to back up to get to the directory root.

All the pages on the site other than the grad colloquium tree are at the root level and thus don't use that session variable