// http://javascript-array.com/scripts/jquery_simple_drop_down_menu/

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

function primary_nav_open()
{  primary_nav_canceltimer();
   primary_nav_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

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

function primary_nav_timer()
{  closetimer = window.setTimeout(primary_nav_close, timeout);}

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

$(document).ready(function()
{  $('#primary_nav > li').bind('mouseover', primary_nav_open)
   $('#primary_nav > li').bind('mouseout',  primary_nav_timer)});

document.onclick = primary_nav_close;