function wait(msecs)
{
    var start = new Date().getTime();
    var cur = start
    while(cur - start < msecs)
    {
        cur = new Date().getTime();
    }
} 

$(document).ready(function(){

 $("ul.dropdown li").hover(function(){
   $(this).addClass("hover");
   $('> .dir',this).addClass("open");
   $('ul:first',this).css('visibility', 'visible');
 },function(){
   wait(400);
   $(this).removeClass("hover");
   $('.open',this).removeClass("open");
   $('ul:first',this).css('visibility', 'hidden');
 });

});