RewriteEngine On
RewriteBase /works/info343/lectures/
RewriteRule ^$ ../index.php?page=lectures [QSA,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [S=2]
RewriteRule ^.*/images/(.*)$ s5/images/$1 [L]
RewriteRule ^([^/]+)/files/[abc]/(.+)$ $1/files/$2 [QSA,L]