User-agent: *
Disallow: /images/
Disallow: /files/screenshots/
Disallow: /files/graphics/
Disallow: /files/audio/

User-agent: Googlebot-Image
Disallow: /images/
Disallow: /files/screenshots/
Disallow: /files/graphics/
Disallow: /files/audio/

User-agent: Googlebot
Disallow: /images/
Disallow: /files/screenshots/
Disallow: /files/graphics/
Disallow: /files/audio/