Stack Exchange Bounty Form JavaScript

example.js

<script>
    $(function() {

        var page = 1;
        $('#start-bounty-popup .next-page').click(function() {
            $('#start-bounty-popup #bountyamount-confirm').html($('#bountyamount option:selected').data('confirm'));
            var popup = $('#start-bounty-popup');
            popup.fadeOut('fast', function() {
                $('#pane-main .page' + page).hide();
                page += 1;
                $('#pane-main .page' + page).show();
                popup.center().fadeIn('fast', function() {
                    if ($('.page3').is(':visible')) {
                        $('#custom-message').focus();
                    }
                });
            });

        });

        $('#start-bounty-popup .back').click(function() {
            var popup = $('#start-bounty-popup');
            popup.fadeOut('fast', function() {
                $('#pane-main .page' + page).hide();
                page -= 1;
                $('#pane-main .page' + page).show();
                popup.center().fadeIn();
            });

        });

        $("#start-bounty-popup a.cancel").click(function() {
            $('#start-bounty-popup .popup-close a').click();
        });

        $('#start-bounty-popup .action-desc').click(function() {
            $(this).closest('li').find('input').click();
        });

        $('#start-bounty-popup #custom-message').charCounter({
            min: 30,
            max: 3000
        });

        $('#start-bounty-form').submit(function() {
            $('#bounty-start').disable();
            var length = $('#start-bounty-popup #custom-message').val().length;
            var good = (length == 0) || (length >= 30 && length <= 3000);

            if (!good) {
                $('#bounty-submit-error').show();
                $('#bounty-start').enable();
            }

            return good;
        });

    });
</script>