ajax_replace_url becomes obsolete, req.build_ajax_replace_url should be used instead The idea is to generate the full URL on the server side and not on the client side (i.e in JS). This way, this gives a chance to the ajax link to work outside the application itself (typically mash-ups).

function set_tab(tabname, cookiename) {
    // set appropriate cookie
    asyncRemoteExec('set_cookie', cookiename, tabname);
    // trigger show + tabname event
    trigger_load(tabname);
}