var timeout    = 1500;//250;
var closetimer = 0;
var ddmenuitem = 0;

function sub_nav_list_open()
{  sub_nav_list_canceltimer();
   sub_nav_list_close();
   ddmenuitem = $(this).find('ul').css('visibility', 'visible');}

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

function sub_nav_list_timer()
{  closetimer = window.setTimeout(sub_nav_list_close, timeout);}

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

$(document).ready(function() {
	$('.main_nav > ul > li').bind('mouseover', sub_nav_list_open);
	$('.main_nav > ul > li').bind('mouseout',  sub_nav_list_timer);
	//$('.main_nav_current').find('ul').css('visibility', 'visible');
});

//document.onclick = sub_nav_list_close;