// Initialise Superfish
jQuery(document).ready(function() { 
        jQuery('div.topnav ul').superfish({ 
            animation:   {opacity:'show',height:'show'},  // fade-in and slide-down animation 
            speed:       'fast',                          // faster animation speed 
            autoArrows:  true,                           // enable generation of arrow mark-up 
            dropShadows: true                            // enable drop shadows 
        }); 
    });