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

function jsddm_open() {
  jsddm_canceltimer();
  jsddm_close();
  ddmenuitem = $(this).find('.submenu_wrapper').css('display', 'block');
}
function jsddm_close() {
  if(ddmenuitem) ddmenuitem.css('display', 'none');
}
function jsddm_timer() {
  closetimer = window.setTimeout(jsddm_close, timeout);
}
function jsddm_canceltimer() {
  if(closetimer) {
    window.clearTimeout(closetimer);
    closetimer = null;
  }
}
$(document).ready(function() {
  $('#nav #submenu li').bind('mouseover', jsddm_open)
  $('#nav #submenu li').bind('mouseout',  jsddm_timer)
});