User-agent: Mediapartners-Google*
Disallow:

User-agent: *
Disallow: /tmp_
Disallow: /mambo/
Disallow: /joomla/
Disallow: /tmp/
Disallow: /downloads/
Disallow: /images/
Disallow: /email_address.php
Disallow: /*.txt$
Disallow: /null.html