$(document).ready(function () {
              var top = $('#case-info').offset().top - parseFloat($('#case-info').css('marginTop').replace(/auto/, 0));
              $(window).scroll(function (event) {
                // what the y position of the scroll is
                var y = $(this).scrollTop();

                // whether that's below the form
                if (y >= top) {
                  // if so, ad the fixed class
                  $('#case-info').addClass('fixed');
                } else {
                  // otherwise remove it
                  $('#case-info').removeClass('fixed');
                }
              });
            });