$(document).ready(function() {
    $(".subMenuHolder").slideToggle();
    $("ul.sublist").animate({ opacity: 0 }, 10);
    $("#NavContent").mouseover(function(){
     openSub();
    });
});

var isOpen = false;
var openTimer = 0;

function openSub(){
  if (!isOpen){
     $(".subMenuHolder").slideToggle();
     $("ul.sublist").animate({ opacity: 1 }, 500);
     isOpen = !isOpen;
 }
 clearInterval(openTimer);
 openTimer = setInterval(closeSub, 4000);
}

function closeSub(){
    if (isOpen) {
        clearInterval(openTimer);
        $(".subMenuHolder").slideToggle();
        $("ul.sublist").animate({ opacity: 0 }, 500);
        isOpen = !isOpen;
  }
}