$(document).ready(function() {
    $('ul#my-menu ul').each(function(i) { // Check each submenu:
        if ($.cookie('submenuMark-' + i)) {  // If index of submenu is marked in cookies:
            $(this).show().prev().removeClass('collapsed').addClass('expanded'); // Show it (add apropriate classes)
        }else {
            $(this).hide().prev().removeClass('expanded').addClass('collapsed'); // Hide it
        }
        $(this).prev().addClass('collapsible').click(function() { // Attach an event listener
            var this_i = $('ul#my-menu ul').index($(this).next()); // The index of the submenu of the clicked link
            if ($(this).next().css('display') == 'none') {
                $(this).next().slideDown(200, function () { // Show submenu:
                    $(this).prev().removeClass('collapsed').addClass('expanded');
                    cookieSet(this_i);
                });
            }else {
                $(this).next().slideUp(200, function () { // Hide submenu:
                    $(this).prev().removeClass('expanded').addClass('collapsed');
                    cookieDel(this_i);
                    $(this).find('ul').each(function() {
                        $(this).hide(0, cookieDel($('ul#my-menu ul').index($(this)))).prev().removeClass('expanded').addClass('collapsed');
                    });
                });
            }
        return false; // Prohibit the browser to follow the link address
        });
    });
});
function cookieSet(index) {
    $.cookie('submenuMark-' + index, 'opened', {expires: null, path: '/'}); // Set mark to cookie (submenu is shown):
}
function cookieDel(index) {
    $.cookie('submenuMark-' + index, null, {expires: null, path: '/'}); // Delete mark from cookie (submenu is hidden):
}