These links may help.
Submit a form with Ajax and jQuery:
http://net.tutsplus.com/tutorials/javascript-ajax/submit-a-form-without-page-refresh-using-jquery/
Validate a form:
solved Submit a Form with Validations using AJAX and PHP [closed]
These links may help.
Submit a form with Ajax and jQuery:
http://net.tutsplus.com/tutorials/javascript-ajax/submit-a-form-without-page-refresh-using-jquery/
Validate a form:
solved Submit a Form with Validations using AJAX and PHP [closed]