User-Agent: Mediapartners-Google* 
Disallow: /images/

User-Agent: Googlebot
Disallow: /images/

User-Agent: MSNBot
Disallow: /images/

User-Agent: Scooter
Disallow: /images/

User-Agent: Slurp
Disallow: /images/

User-Agent: Yahoo-Newscrawler
Disallow: /images/

User-Agent: YahooYSMcm
Disallow: /images/

User-Agent: * 
Disallow: /