Club Drupal

    // Keep keyboard focus from going to the browser chrome.

    $('body', context).once(function () {

      $(window).bind('keydown', function (event) {

        if (event.keyCode === 9) {

          var tabbables = $(':tabbable'),

              first = tabbables.filter(':first'),

              last = tabbables.filter(':last'),

              new_event;

          if ((event.target === last[0] && !event.shiftKey) || (event.target === first[0] && event.shiftKey)) {

            // If we're at the end of the tab list, then send a keyboard event

            // to the parent iframe.

            if (parent_iframe = Drupal.media.browser.getParentIframe(window)) {

              $('.ui-dialog-titlebar-close', $(parent_iframe).closest('.ui-dialog')).focus();

              event.preventDefault();

              return false;

            }

          }

        }

      });

    });