User-agent: Yandex 
Disallow: */reg/*
Allow: /media/images/
Allow: /img/

User-agent: Googlebot 
Disallow: */reg/*
Allow: /media/images/
Allow: /img/

User-agent: * 
Disallow: */reg/*
Allow: /media/images/
Allow: /img/

User-agent: Googlebot-Image
Allow: /media/images/
Allow: /img/

User-agent: YandexImages
Allow: /media/images/
Allow: /img/

User-agent: Mediapartners-Google
Disallow:

User-Agent: YaDirectBot
Disallow: