RewriteEngine On
RewriteCond %{HTTP_HOST} ^(www.)?ncretac.org$
RewriteCond %{REQUEST_URI} !^/joomla/
RewriteRule ^(.*)$ /joomla/$1
RewriteCond %{HTTP_HOST} ^(www.)?ncretac.org$
RewriteRule ^(/)?$ joomla/index.php [L]