User-agent: Mediapartners-Google*
Disallow:
User-Agent: W3C-checklink
Disallow: 
User-agent: googlebot
Disallow: *.gif 
Disallow: *.jpg
User-agent: googlebot-image
Disallow: *.gif 
Disallow: *.jpg
User-agent: msnbot
Disallow: *.gif
Disallow: *.jpg