= Contact form for AJAX requests

  Server side is written in Sinatra
  Client side is written in Javascript with JQuery

  You must...
    - include client.js on the client side
    - create #success and #error elements
    - add hidden input field with name "domain" where value matches one case condition in server side script
    - have at least #name, #email and #message input fields
    - add class "req" to required fields for marking invalid inputs

  Form action is server document root and method is GET