RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteRule "([^/]*)\.js$" retro-compat.js.php?file=$1.js [QSA,L] RewriteCond %{REQUEST_FILENAME} !-f RewriteRule "([^/]*)\.css$" ../css/retro-compat.css.php?file=$1.css [QSA,L]