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

  document.onclick = jsddm_close;
});