User-agent: Googlebot
Disallow: /*_photo_*.jpg$

User-agent: Googlebot-Image
Disallow: /*_photo_*.jpg$

User-agent: Slurp
Disallow: /*_photo_*.jpg$

User-agent: msnbot-media
Disallow: /*_photo_*.jpg$

User-agent: *
Disallow: /*_photo_*.jpg$