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

function aka_open()
{  aka_canceltimer();
   aka_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

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

function aka_timer()
{  closetimer = window.setTimeout(aka_close, timeout);}

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

$(document).ready(function()
{  $('#aka > li').bind('mouseover', aka_open)
   $('#aka > li').bind('mouseout',  aka_timer)});

document.onclick = aka_close;