floating.js

  var offset = $("#filter-search").offset();
  var topPadding = 100;
  $(window).scroll(function() {
      if ($(window).scrollTop() > offset.top) {
          $("#filter-search").stop().animate({
              marginTop: $(window).scrollTop() - offset.top + topPadding
          });
      } else {
          $("#filter-search").stop().animate({
              marginTop: 0
          });
      };
  });