document.write("<select name='citylistb' id='citylistb' onchange='javascrip:selectCityb();'>");
document.write("<option value=''>选择城市</option>");
document.write("<option value='010' selected>　北京</option>");
document.write("<option value='021'>　上海</option>");
document.write("<option value='020'>　广州</option>");
document.write("<option value='022'>　天津</option>");
document.write("<option value='025'>　南京</option>");
document.write("<option value='027'>　武汉</option>");
document.write("<option value='0411'>　大连</option>");
document.write("<option value='0769'>　东莞</option>");
document.write("<option value='0755'>　深圳</option>");
document.write("<option value='0371'>　郑州</option>");
document.write("</select>");