User-agent: *
Disallow: /img/
Disallow: /images/
Disallow: /files/
Disallow: /js/
Disallow: /textpattern/

User-agent: Googlebot
Disallow: /*.gif$
Disallow: /*.jpg$
Disallow: /*.pdf$
Disallow: /*.png$

User-agent: Googlebot-Image
Disallow: /