$(document).ready(function() {

  
  var hideIt = 1;
    $("ul.dropdown").removeClass("dropdown_js");
    $("ul.sub_menu").removeClass("sub_menu_js");
    
    $("ul.dropdown li").click(function(){
    
        $(this).addClass("hover");
        var currentMenu = $(this);
        $('ul:first',this).css('visibility', 'visible');
        setTimeout( function(){ if(hideIt==1) $('ul:first',currentMenu).css('visibility', 'hidden'); }, 1000);
    });
    
    $("ul.dropdown li > ul").mouseover(function(){
      hideIt=0;    
    });
    
    $("ul.sub_menu").mouseleave(function(){    
      
      var currentItem = $(this);      
      hideIt=1;
      setTimeout( function(){ if(hideIt==1) $(currentItem).css('visibility', 'hidden'); }, 1000);
    });
    
});