var subsecondClass = new Array();
var subthirdClass = new Array();
subsecondClass[0] = new Array('42','32','电脑知识')
subsecondClass[1] = new Array('43','32','互联网')
subsecondClass[2] = new Array('44','32','操作系统')
subsecondClass[3] = new Array('45','32','软件')
subsecondClass[4] = new Array('46','32','硬件')
subsecondClass[5] = new Array('47','32','编程开发')
subsecondClass[6] = new Array('48','32','电脑安全')
subsecondClass[7] = new Array('49','32','资源分享')
subsecondClass[8] = new Array('50','32','笔记本电脑')
subsecondClass[9] = new Array('34','33','手机/通讯')
subsecondClass[10] = new Array('35','33','平板电脑')
subsecondClass[11] = new Array('36','33','手机品牌')
subsecondClass[12] = new Array('37','33','其他数码')
subsecondClass[13] = new Array('38','33','手机系统')
subsecondClass[14] = new Array('39','33','MP3/MP4')
subsecondClass[15] = new Array('40','33','照相机/摄像机')
subsecondClass[16] = new Array('41','33','数码品牌')
subsecondClass[17] = new Array('52','51','综合赛事/奥运会')
subsecondClass[18] = new Array('53','51','篮球')
subsecondClass[19] = new Array('54','51','足球')
subsecondClass[20] = new Array('55','51','体育明星')
subsecondClass[21] = new Array('56','51','田径')
subsecondClass[22] = new Array('57','51','跳水游泳')
subsecondClass[23] = new Array('58','51','小球运动')
subsecondClass[24] = new Array('59','51','赛车赛事')
subsecondClass[25] = new Array('60','51','强身健体')
subsecondClass[26] = new Array('62','51','排球')
subsecondClass[27] = new Array('61','51','运动品牌')
subsecondClass[28] = new Array('63','51','彩票')
subsecondClass[29] = new Array('65','64','电影电视')
subsecondClass[30] = new Array('66','64','明星')
subsecondClass[31] = new Array('67','64','音乐')
subsecondClass[32] = new Array('68','64','动漫')
subsecondClass[33] = new Array('69','64','星座')
function showSecondClass(selectValue)
{
document.getElementById('SmallClassID').length = 0;
document.getElementById('SmallClassID').options[0] = new Option('请选择','');
document.getElementById('ClassID').length = 0;
document.getElementById('ClassID').options[0] = new Option('请选择','');
for (var i=0; i<subsecondClass.length; i++)
{
 if (subsecondClass[i][1] == selectValue)
{
 document.getElementById('SmallClassID').options[document.getElementById('SmallClassID').length] = new Option(subsecondClass[i][2], subsecondClass[i][0]);
 }
 }
if (document.getElementById('SmallClassID').length>1) { document.getElementById('SmallClassID').style.display=''; }else{ document.getElementById('SmallClassID').style.display='none'; } }
function showThirdClass(selectValue)
{
document.getElementById('ClassID').length = 0;
document.getElementById('ClassID').options[0] = new Option('请选择','');
for (var i=0; i<subthirdClass.length; i++)
{
 if (subthirdClass[i][1] == selectValue)
  {
    document.getElementById('ClassID').options[document.getElementById('ClassID').length] = new Option(subthirdClass[i][2], subthirdClass[i][0]);
  }
 }
 if (document.getElementById('ClassID').length>1) { document.getElementById('ClassID').style.display=''; }else{ document.getElementById('ClassID').style.display='none'; }  }
document.write ("<select name='BigClassID' id='BigClassID' onChange='showSecondClass(this.value);'>");
document.write ("<option value='' selected>选择分类</option>");document.write ("<option value='32'>2017级问吧</option>");
document.write ("<option value='33'>2016级问吧</option>");
document.write ("<option value='51'>2015级问吧</option>");
document.write ("<option value='64'>我爱青岛实验高中</option>");
document.write ("</select>");
document.write (" <select name='SmallClassID' style='display:none;width:100px' id='SmallClassID' onChange='showThirdClass(this.value);'>");document.write ("<option value='' selected>请选择</option>");document.write ("</select>");
document.write (" <select name='ClassID' style='display:none;width:100px' id='ClassID'>");document.write ("<option value='' selected>请选择</option>");document.write ("</select>");