var timeout         = 500;
var closetimer		= 0;
var ddmenuitem      = 0;
function MainNav_open(){
MainNav_canceltimer();
MainNav_close();
ddmenuitem = $(this).find('ul').eq(0).css('visibility', 'visible');}
function MainNav_close(){
if(ddmenuitem) ddmenuitem.css('visibility', 'hidden');}
function MainNav_timer(){
closetimer = window.setTimeout(MainNav_close, timeout);}
function MainNav_canceltimer(){
if(closetimer){
window.clearTimeout(closetimer);
closetimer = null;}}
$(document).ready(function(){
$('#MainNav > li').bind('mouseover', MainNav_open)
$('#MainNav > li').bind('mouseout',  MainNav_timer)});
document.onclick = MainNav_close;