How to load local JSON files in Javascript

Unless we add extension .json and MIMETYPE application\json, IIS will throw an error.

See here: http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/cd72c0dc-c5b8-42e4-96c2-b3c656f99ead.mspx?mfr=true

onreadystatechange property has no capital letters. See: MDC XMLHttpRequest