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$(document).ready(function () {
    var summaries = $('#form-a');
        summaries.each(function(i) {
            var summary = $(summaries[i]);
            var next = summaries[i + 1];
            summary.scrollToFixed({
                marginTop: $('.header').outerHeight(true) + 10,
                limit: function() {
                    var limit = 0;
                    if (next) {
                        limit = $(next).offset().top - $(this).outerHeight(true) - 10;
                    } else {
                        limit = $('.footer').offset().top - $(this).outerHeight(true) - 10;
                    }
                    return limit;
                },
                zIndex: 999
            });
        });
    });