$(document).ready(
           function(){
                $('#block-menu-primary-links .menu li:nth-child(2)').mouseenter(
                    function(){
                          $('.dropdown-features').show();
                    });
                $('#block-menu-primary-links .menu li:nth-child(2)').mouseleave(
                    function(){
                          $('.dropdown-features').hide();
                    });
                $('.dropdown-features').mouseenter(
                    function(){
                          $('.dropdown-features').show();
                    });   
                $('.dropdown-features').mouseleave(
                    function(){
                          $('.dropdown-features').hide();
                    });               
       });