var timeout    = 400;
var closetimer = 0;
var ddmenuitem = 0;

function navMenu_open()
{  navMenu_canceltimer();
   navMenu_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

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

function navMenu_timer()
{  closetimer = window.setTimeout(navMenu_close, timeout);}

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

$(document).ready(function()
{  $('#navMenu > li').bind('mouseover', navMenu_open)
   $('#navMenu > li').bind('mouseout',  navMenu_timer)});

document.onclick = navMenu_close;