var timeout = 500;
var closetimer = 0;
var menuitem = 0;
var imageitem = 0;

function open()
{  canceltimer();
   close();
   menuitem = $(this).find('ul').css('visibility', 'visible');
   imageitem = $(this).find('a.image').css('background-image', 'url("images/common/nav-button-hover.png")');}

function close()
{  if(menuitem) {menuitem.css('visibility', 'hidden');}
   if (imageitem) {imageitem.css('background-image', 'url("images/common/nav-button.png")');}}

function timer()
{  closetimer = window.setTimeout(close, timeout);}

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

$(document).ready(function()
{  $('#menu > li').bind('mouseover', open);
   $('#menu > li').bind('mouseout',  timer);});

document.onclick = close;