var getMenuItems = (function () {
    var cache = [],
        cacheMenuItems = function () {
            $('#nav li a').each(function () {
                var $this = $(this);
                cache.push({
                    value: $this.attr('href'),
                    title: $this.text()
                });
            });
            return cache;
        };

    return function (request, response) {
        var data = (cache.length) ? cache : cacheMenuItems(),
            matcher = new RegExp($.ui.autocomplete.escapeRegex(request.term), 'i'),
            filtered = $.grep(data, function (item) {
                return matcher.test(item.title);
            });
        response(filtered);
        return true;
    };
})();

var renderLangItem = function (ul, item) {
    return $(document.createElement('li'))
        .data('item.autocomplete', item)
        .append(
            $(document.createElement('a'))
                .append($(document.createElement('img')).prop('src', item.icon))
                .append(document.createTextNode(item.title))
        )
        .appendTo(ul);
};