var lockedItem = null;

var lock = {
    addExternal: function (elements) {
        //отключаем обновление странички
        if (!canChangeDeliveryState) {
            $(elements.join(',')).each(function (i, el) { $(el).get(0).onchange = null; });
        }
    },

    add: function(element, displayElement) {
        $(element + ',' + displayElement).click(function () {
            lockedItem = $(this).find(':selected');
        }).change(function () {
            if (!canChangeDeliveryState) {
                lockedItem.attr('selected', true);
                alert('Извините, доставка возможна только в г. ' + $(displayElement).find(':selected').text().trim());
            }
         });
    }
};

$(document).ready(function () {
    lock.addExternal(['#main_country', '#main_city']);
    lock.add('#country_list_ajax', '#city_list_ajax');
    lock.add('#id_country', '#id_city');
    lock.add('#main_country', '#main_city');
});