用XML实现国家、省的动态关联，酷！建议加入精华备查。

<script>
<!--
/----------无垠网域-------------------/
/----------嘻哈呵嘿-------------------/
    /* 切换国家对应省所用的函数 */
    function populateSheng()
    {
        pri = main.country.options(main.country.selectedIndex).value;
        var oXMLDoc = new ActiveXObject('MSXML');
        sURL = 'http://210.192.103.40/HAS_Client/UserReg/change_place_dshxml.asp?pri=' + pri;
        
        oXMLDoc.url = sURL;
        var oRoot=oXMLDoc.root;
        if(oRoot.children != null)
        {     
       //删除省选择框中的所有选项
       for(var i=main.province.options.length-1;i>=0;--i)
       {
           main.province.options.remove(i)
       }
       var i=0;
       //往省选择框中增加选项
       while (i<oRoot.children.length)
       {
           oval = oRoot.children.item(i);
           i=i+1;
           oname = oRoot.children.item(i);
           sval = oval.text;
           sname = oname.text;

补充：asp教程,XML相关