$(document).ready(function() {
  var timeout       = 500;
  var closetimer		= 0;
  var ddmenuitem    = 0;

  function jsddm_open() {
    jsddm_canceltimer();
    jsddm_close();
    ddmenuitem = $(this).find('ul').eq(0).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;
    }
  }

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

  document.onclick = jsddm_close;
});