使用jquery和该框的单击事件自动填充国家名称列表框

My form has a list box that asks for the user's country but I only want to populate the list box, via an AJAX call, if the box doesn't already show the user's country. Initially the list box contains just one country - the country returned from a ip-to-country lookup on the server.My form has a list box that asks for the user's