$$('ul#walk_sub_pages li').each(function(li){ li.removeClassName('active') });
$('multimedia_tab_photos').addClassName('active');
Element.update("walk_multimedia_content_wrap", "    <div id=\"multimedia_photo_display_wrap\" data-flickr-photoset-id=\"72157625638459176\">\n      <a class=\"prev\">prev</a>\n      <a class=\"next\">next</a>\n    </div>\n\n\n");
jQuery("[data-flickr-photoset-id]").flickrPhotoset();