$select.find("option").each(function() {
              // Cache $(this)
                var $this = $(this);
              methods._addOption($ul, $this);

        var $hasOptGroups = $select.find("optgroup");
        if ($hasOptGroups.length > 0) {
            $hasOptGroups.each(function () {
                //add in the option group label
                var $optgroup = "<span class='optgroup'>" + $(this).attr("label") + "</span>";
                $ul.append($optgroup);
                //loop through the list and add each option
                $(this).find("option").each(function() {
                    // Cache $(this)
                    var $this = $(this);
                    methods._addOption($ul, $this);
                });
            });
        } else {
            // Loop trough options and transfer them to the dropdown menu
            $select.find("option").each(function() {
              // Cache $(this)
                var $this = $(this);
              methods._addOption($ul, $this);

            });            
        }