As for [1], create a file index.php in your "health" folder with just "<?php echo "hello world"; ?>" and go to http://health.jbdirectory.com/ if you see the "hello world" message, it probably means [1].
Alexis
You can just place in such index.php define( 'LOCALSETTINGS', dirname( __FILE__ ) . '/LocalSettings.php' ); chdir('../common mediawiki'); require 'index.php';
And in the LocalSettings at common mediawiki folder: require 'LOCALSETTINGS';