$(document).ready(function(){  
      
        $("ul.dropdown li a").hover(function() { //Quando sono sopra al link del menu...
      
            //Following events are applied to the subnav itself (moving subnav up and down)  
            $(this).parent().find("ul.subnav").slideDown('fast').show(); //Drop down the subnav on click  
      
            $(this).parent().hover(function() {  
            }, function(){  
                $(this).parent().find("ul.subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up  
            });  

            });  
      
    });