Next input form when Enter's clicked

http://jsfiddle.net/hxZSU/1/

$('#subscribeModal').on('keydown', 'input', function (event) {

if (event.which == 13) {

event.preventDefault();

var $this = $(event.target);

var index = parseFloat($this.attr('data-index'));

$('[data-index="' + (index + 1).toString() + '"]').focus();

if (index < 2) return;

subscribe();

}

});