document.write('请选各省 : ');
document.write('<select onchange="location.href = this.options[selectedIndex].value" >');
document.write('<option selected="selected" value="index.html">请选择</option>');
document.write('<option value="p1.html">黑龙江</option>');
document.write('<option value="p2.html">吉林</option>');
document.write('<option value="p3.html">辽宁</option>');
document.write('<option value="p4.html">内蒙古</option>');

document.write('<option value="p5.html">北京</option>');
document.write('<option value="p6.html">河北</option>');
document.write('<option value="p7.html">天津</option>');
document.write('<option value="p8.html">山东</option>');
document.write('<option value="p9.html">山西</option>');
document.write('<option value="p10.html">河南</option>');

document.write('<option value="p11.html">上海</option>');
document.write('<option value="p12.html">浙江</option>');
document.write('<option value="p13.html">江苏</option>');
document.write('<option value="p14.html">湖北</option>');
document.write('<option value="p15.html">安徽</option>');
document.write('<option value="p16.html">海南</option>');

document.write('<option value="p17.html">广东</option>');
document.write('<option value="p18.html">广西</option>');
document.write('<option value="p19.html">湖南</option>');
document.write('<option value="p20.html">福建</option>');
document.write('<option value="p21.html">江西</option>');
document.write('<option value="p22.html">四川</option>');

document.write('<option value="p23.html">陕西</option>');
document.write('<option value="p24.html">甘肃</option>');
document.write('<option value="p25.html">宁夏</option>');
document.write('<option value="p26.html">重庆</option>');
document.write('<option value="p27.html">云南</option>');
document.write('<option value="p28.html">新疆</option>');

document.write('<option value="p29.html">贵州</option>');
document.write('<option value="p30.html">青海</option>');

document.write('</select>');