Using superfish.js and Wordpress

// IMPROVE WORDPRESS DROPDOWN MAIN MENU WITH SOME DELAY, USING superfish.js JQUERY PLUGIN

// MAIN MENU FINETUNING
    var maxWidth = $('#header').width() + $('#header').offset().left;
    var menu, menuWidth, delta, menuLeft = 0;
    $('#menu-main-menu').superfish({
        autoArrows: false,
        speed: 'fast',
        hoverClass: 'selected-menu',
        onInit: function() {
            // Make sure the rightmost dropdown does not overflow the interface
            $('#menu-main-menu ul.sub-menu').each(function(){
                menu = $(this);

                menuWidth = menu.width();

                menu.show(); // offset() does not work if element is hidden, so we show(), measure, then hide() it immediatly.
                menuLeft = menu.offset().left;
                menu.hide();

                delta = maxWidth - (menuLeft + menuWidth);
                if (delta < 0) {
                    menuLeft = delta;
                } else {
                    menuLeft = 0;
                }
                menu.css({
                    left: menuLeft
                });
            });
        }
    });