Very simple AJAX/jQuery/PHP Registration form

Avg Bid (EUR)
Project Budget (EUR)
€30 - €250

Project Description:
I need a VERY SIMPLE web form to register users. SImilar with twitter login form, for example (
a)- username (AJAX/jQuery should validate it is availlable - based on Users table querying / field "Username")
b)- password
c) - email (AJAX/jQ should say it not exists in Users table / field "Email"; if exists should provide a link to existing user)
d) - geografical location = city (AJAX/jQuery should provide a list of suggestions as user types; user can select one from the list, program will autocomplete the rest of letters)
1) the form should work on mobile and tablets! (should be "autoresizable" on smaller device-resolution
2) [optional] the form should permit users to register with a Faceboo account - but with distinct username creating also in Users Table)

Skills required:
AJAX, jQuery / Prototype, MySQL, PHP
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