User-agent: * 
Disallow: /administrator
Disallow: /cache
Disallow: /components
Disallow: /editor
Disallow: /help
Disallow: /includes
Disallow: /language
Disallow: /mambots
Disallow: /media
Disallow: /modules
Disallow: /templates
Disallow: /installation

User-agent: Mediapartners-Google
Allow: /

User-agent: Adsbot-Google
Allow: /
 
User-agent: Googlebot-Image
Allow: /
 
User-agent: Googlebot-Mobile
Allow: /