gistfile1.txt

$(document).ready(function() {
  $('input[type="submit"]').click(function() {
		event.preventDefault();

		var email = $('.email').val();

		$.ajax({
			type: "POST",
			url: "register_email.php",
			dataType: "json",
			data: { email: email },
			success: function(data) {
				alert(data.email);
			},
			error: function(jqXHR, textStatus, errorThrown) {
				alert(textStatus + " " + errorThrown);
			}
		});
	});
});