$(document).ready(function(){

          $("ul.topnav li a").hover(function() { //When trigger is clicked...
          
          //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('fast'); //When the mouse hovers out of the subnav, move it back up
          });

          //Following events are applied to the trigger (Hover events for the trigger)
          }).hover(function() { 
               $(this).addClass("subhover"); //On hover over, add class "subhover"
          }, function(){     //On Hover Out
               $(this).removeClass("subhover"); //On hover out, remove class "subhover"
     });

});