User-agent: *
Disallow: /img/
Disallow: /images/
Disallow: /karten/

User-agent: linkwalker
Disallow: /

User-agent: http://www.almaden.ibm.com/cs/crawler
Disallow: /

User-agent: JetBot
Disallow: /

User-Agent: Googlebot-Image
Disallow: /