用XML实现国家、省的动态关联，酷！建议加入精华备查。


答案：<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;
                var oOption = document.createElement('OPTION');
                oOption.text = sname;
                oOption.value = sval;
                main.province.options.add(oOption);
                i=i+1;
            }
            
            //删除市选择框中的所有选项
            for(var i=main.city.options.length-1;i>=0;--i)
            {
                main.city.options.remove(i)
            }
            //往市选择框中增加选项
            var oOption1 = document.createElement('OPTION');
            oOption1.text = "请选择";
            oOption1.value = 0;
            main.city.options.add(oOption1);
        }
    }

    /* 切换省对应市所用的函数 */
    function populateCity()
    {
        pri = main.province.options(main.province.selectedIndex).value;
        var oXMLDoc = new ActiveXObject('MSXML');    
        sURL = 'http://210.192.103.40/HAS_Client/UserReg/change_place_dchxml.asp?pri=' + pri;
        
        oXMLDoc.url = sURL;
        var oRoot=oXMLDoc.root;
        if(oRoot.children != null)
        {   
            //删除市选择框中的所有选项
            for(var i=main.city.options.length-1;i>=0;--i)
            {
                main.city.options.remove(i)
            }
            var i=0;
            //往市选择框中增加选项
            while (i<oRoot.children.length)
            {
                oval = oRoot.children.item(i);
                i=i+1;
                oname = oRoot.children.item(i);
                sval = oval.text;
                sname = oname.text;
                var oOption = document.createElement('OPTION');
                oOption.text = sname;
                oOption.value = sval;
                main.city.options.add(oOption);
                i=i+1;
            }
        }
    }
//-->
</script>

<body>
<form name="main" method="post">
     国家或地区：<select id=country name=country size=1 onchange=populateSheng()>
                      <option selected value="">请选择</option>
                  &n
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