$(function () {

    //Do what we need to when form is submitted.	
    $('#form_submit').click(function () {

        //Setup any needed variables.
        var input_name = $('#form_name').val(),
            input_email = $('#form_email').val(),
            input_subject = $('#form_subject').val(),
            input_message = $('#form_message').val(),
            response_text = $('#response');
        //Hide any previous response text 
        response_text.hide();

        //Change response text to 'loading...'
        response_text.html('Loading...').show();

        //Make AJAX request 
        $.post('contact/php/contact-send.php', {
            name: input_name,
            email: input_email,
            subject: input_subject,
            message: input_message
        }, function (data) {
            response_text.html(data);
        });

        //Cancel default action
        return false;
    });

});