gistfile1.js

twttr.app.currentPage().repositionDetailsPane = function () {
  if (!twttr.decider.goodAtCss()) {
      return
  }
  var B = $('.details-pane-outer', this); // this.$find(".details-pane-outer");
  if (this.windowHasHorizontalScroll()) {
      var C = twttr.$win.scrollTop();
      B.addClass("tracking-vertically");
      B.css({
          "margin-top": C,
          top: 0
      })
  } else {
      var E = $("#page-outer");
      var D = parseInt(E.css("padding-top"), 10);
      B.removeClass("tracking-vertically");
      B.css({
          "margin-top": null,
          top: D
      })
  }
}