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

function jsddm_open() {
   jsddm_canceltimer();
   jsddm_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');
   //ddmenuitem = $(this).find('ul').show(true);
   //$('#mainnav > li').one('mouseout',  jsddm_timer);
}

function jsddm_close() {
   if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');
   //if(ddmenuitem) ddmenuitem.hide(true);
   //$('#mainnav > li').one('mouseover', jsddm_open);
}

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

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

$(document).ready(function() {
   $('#mainnav > li').bind('mouseover', jsddm_open);
   $('#mainnav > li').bind('mouseout',  jsddm_timer);
});

document.onclick = jsddm_close;