jQuery mobileMenu Function. Breaks in jQuery 1.8.3

(function (a) {
    var b = 0;
    a.fn.mobileMenu = function (c) {
        function m(a) {
            if (f() && !g(a)) {
                l(a)
            } else if (f() && g(a)) {
                j(a)
            } else if (!f() && g(a)) {
                k(a)
            }
        }
        function l(b) {
            if (e(b)) {
                var c = '<select id="mobileMenu_' + b.attr("id") + '" class="mobileMenu">';
                c += '<option value="">' + d.topOptionText + "</option>";
                b.find("li").each(function () {
                    var b = "";
                    var e = a(this).parents("ul, ol").length;
                    for (i = 1; i < e; i++) {
                        b += d.indentString
                    }
                    var f = a(this).find("a:first-child").attr("href");
                    var g = b + a(this).clone().children("ul, ol").remove().end().text();
                    c += '<option value="' + f + '">' + g + "</option>"
                });
                c += "</select>";
                b.parent().append(c);
                a("#mobileMenu_" + b.attr("id")).change(function () {
                    h(a(this))
                });
                j(b)
            } else {
                alert("mobileMenu will only work with UL or OL elements!")
            }
        }
        function k(b) {
            b.css("display", "");
            a("#mobileMenu_" + b.attr("id")).hide()
        }
        function j(b) {
            b.hide("display", "none");
            a("#mobileMenu_" + b.attr("id")).show()
        }
        function h(a) {
            if (a.val() !== null) {
                document.location.href = a.val()
            }
        }
        function g(c) {
            if (c.attr("id")) {
                return a("#mobileMenu_" + c.attr("id")).length > 0
            } else {
                b++;
                c.attr("id", "mm" + b);
                return a("#mobileMenu_mm" + b).length > 0
            }
        }
        function f() {
            return a(window).width() < d.switchWidth
        }
        function e(a) {
            return a.is("ul, ol")
        }
        var d = {
            switchWidth: 768,
            topOptionText: "Select a page",
            indentString: "   "
        };
        return this.each(function () {
            if (c) {
                a.extend(d, c)
            }
            var b = a(this);
            a(window).resize(function () {
                m(b)
            });
            m(b)
        })
    }
})(jQuery);

jQuery(document).ready(function () {
    jQuery('ul#top-nav').mobileMenu({
        switchWidth: 767, //width (in px to switch at)
        topOptionText: 'Select a page', //first option text
        indentString: '&nbsp;&nbsp;&nbsp;' //string for indenting nested items
    });
});