var timeout    = 500;
    var closetimer = 0;
    var ddmenuitem = 0;

    function jsddm_open() {
      jsddm_canceltimer();
      jsddm_close();
      ddmenuitem = $(this).find('ul').css('visibility', 'visible');
    }

    function jsddm_close() {
      if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
    }

    function jsddm_timer() {
      closetimer = window.setTimeout(jsddm_close, timeout);
    }

    function jsddm_canceltimer() {
      if(closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
      }
    }