Cacher is the code snippet organizer for pro developers

Disallow: /http://www.jshinncreative.co.uk/index.php?option=com_aicontactsafe&sTask=captcha&task=captcha&pf= 
This code should be enough: 
Code:
Disallow: /index.php?option=com_aicontactsafe&sTask=captcha

Robots.txt Generator
http://www.mcanerin.com/EN/search-engine/robots-txt.asp

Robots.txt Analysis - Check whether your site can be accessed by Robots or not (Google,Yahoo,MSN)
http://phpweby.com/services/robots

Example of a perfect Kentico Robots.txt file
User-agent: *
Allow: /
Disallow: /*.axd$
Disallow: /CMSResources/
Disallow: /CMSTemplates/
Disallow: /App_Browsers/
Disallow: /CommunitySite/
Disallow: /CMSSiteUtils/
Disallow: /CorporateSiteAspx/
Disallow: /CMSSiteManager/
Disallow: /PersonalSite/
Disallow: /CMSFormControls/
Disallow: /App_WebReferences/
Disallow: /CMSHelp/
Disallow: /App_Data/
Disallow: /CMSPages/
Disallow: /CorporateSite/
Disallow: /Bin/
Disallow: /CMSControlsExamples/
Disallow: /CMSMessages/
Disallow: /App_Code/
Disallow: /ClientBin/
Disallow: /App_Themes/
Disallow: /CMSDesk/
Disallow: /CMSAdminControls/
Disallow: /CMSInstall/
Disallow: /CMSScripts/
Disallow: /CMSModules/
Disallow: /CMSMasterPages/
Disallow: /CMSWebParts/

Sitemap: http://example.com/cmspages/googlesitemap.aspx