function SelectProvince() {
                 var drp2 = document.getElementById("City"); //市县一级
                 var drp3 = document.getElementById("Area"); //区一级
                 for (var i = drp2.options.length; i >= 0; i--) {
                     drp2.remove(i);
                 }
                 for (var i = drp3.options.length; i >= 0; i--) {
                     drp3.remove(i);
                 }
                 var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
                 var oDoc = new ActiveXObject("MSXML2.DOMDocument");
                 var province = document.getElementById("Province").value;
                 oHttpReq.open("post", "/aspx/selectarea.aspx?flag=1&province=" + province, false);
                 oHttpReq.setrequestheader("content-type", "application/x-www-form-urlencoded");
                 oHttpReq.send("");
                 var result = oHttpReq.responseText;
                 var newOption_0 = document.createElement("OPTION");
                 newOption_0.text = "-请选择-";
                 newOption_0.value = '0';
                 drp2.options.add(newOption_0);
                 oDoc.loadXML(result);
                 //这里要说一下，items1和items2是你在后面程序中得到的一个xml表。对于//NewDataSet/city/name是怎么来的，你可以用alert(result);看一下就行
                 items1 = oDoc.selectNodes("//NewDataSet/city/Title");
                 items2 = oDoc.selectNodes("//NewDataSet/city/Id");

                 var itemsLength = items1.length;

                 for (i = 0; i < itemsLength; i++)

                 //将小类的类名和编号赋予DropDownList2
                 {
                     var newOption = document.createElement("OPTION");
                     newOption.text = items1[i].text;
                     newOption.value = items2[i].text;
                     drp2.options.add(newOption);
                 }
             }


             function SelectCity() {
                 var drp3 = document.getElementById("Area");
                 for (var i = drp3.options.length; i >= 0; i--) {
                     drp3.remove(i);
                 }

                 var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
                 var oDoc = new ActiveXObject("MSXML2.DOMDocument");
                 var city = document.getElementById("City").value;
                 oHttpReq.open("post", "/aspx/selectarea.aspx?flag=2&city=" + city, false);
                 oHttpReq.setrequestheader("content-type", "application/x-www-form-urlencoded");
                 oHttpReq.send("");
                 var result = oHttpReq.responseText;
                 var newOption_0 = document.createElement("OPTION");
                 newOption_0.text = "-请选择-";
                 newOption_0.value = '0';
                 drp3.options.add(newOption_0);
                 oDoc.loadXML(result);
                 var items = oDoc.selectNodes("//NewDataSet/area");
                 for (var item = items.nextNode(); item; item = items.nextNode()) {
                     var areaName = item.selectSingleNode("Title").nodeTypedValue;
                     var areaCode = item.selectSingleNode("Id").nodeTypedValue;
                     var newOption = document.createElement("OPTION");
                     newOption.text = areaName;
                     newOption.value = areaCode;
                     drp3.options.add(newOption);
                 }
             }
			 
			 function SelectPProvince() {
                 var drp2 = document.getElementById("PCity"); //市县一级
                 var drp3 = document.getElementById("PArea"); //区一级
                 for (var i = drp2.options.length; i >= 0; i--) {
                     drp2.remove(i);
                 }
                 for (var i = drp3.options.length; i >= 0; i--) {
                     drp3.remove(i);
                 }
                 var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
                 var oDoc = new ActiveXObject("MSXML2.DOMDocument");
                 var province = document.getElementById("PProvince").value;
                 oHttpReq.open("post", "/aspx/selectarea.aspx?flag=1&province=" + province, false);
                 oHttpReq.setrequestheader("content-type", "application/x-www-form-urlencoded");
                 oHttpReq.send("");
                 var result = oHttpReq.responseText;
                 var newOption_0 = document.createElement("OPTION");
                 newOption_0.text = "-请选择-";
                 newOption_0.value = '0';
                 drp2.options.add(newOption_0);
                 oDoc.loadXML(result);
                 //这里要说一下，items1和items2是你在后面程序中得到的一个xml表。对于//NewDataSet/city/name是怎么来的，你可以用alert(result);看一下就行
                 items1 = oDoc.selectNodes("//NewDataSet/city/Title");
                 items2 = oDoc.selectNodes("//NewDataSet/city/Id");

                 var itemsLength = items1.length;

                 for (i = 0; i < itemsLength; i++)

                 //将小类的类名和编号赋予DropDownList2
                 {
                     var newOption = document.createElement("OPTION");
                     newOption.text = items1[i].text;
                     newOption.value = items2[i].text;
                     drp2.options.add(newOption);
                 }
             }


             function SelectPCity() {
                 var drp3 = document.getElementById("PArea");
                 for (var i = drp3.options.length; i >= 0; i--) {
                     drp3.remove(i);
                 }

                 var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
                 var oDoc = new ActiveXObject("MSXML2.DOMDocument");
                 var city = document.getElementById("PCity").value;
                 oHttpReq.open("post", "/aspx/selectarea.aspx?flag=2&city=" + city, false);
                 oHttpReq.setrequestheader("content-type", "application/x-www-form-urlencoded");
                 oHttpReq.send("");
                 var result = oHttpReq.responseText;
                 var newOption_0 = document.createElement("OPTION");
                 newOption_0.text = "-请选择-";
                 newOption_0.value = '0';
                 drp3.options.add(newOption_0);
                 oDoc.loadXML(result);
                 var items = oDoc.selectNodes("//NewDataSet/area");
                 for (var item = items.nextNode(); item; item = items.nextNode()) {
                     var areaName = item.selectSingleNode("Title").nodeTypedValue;
                     var areaCode = item.selectSingleNode("Id").nodeTypedValue;
                     var newOption = document.createElement("OPTION");
                     newOption.text = areaName;
                     newOption.value = areaCode;
                     drp3.options.add(newOption);
                 }
             }
			 
			 function SelectMProvince() {
                 var drp2 = document.getElementById("MCity"); //市县一级
                 var drp3 = document.getElementById("MArea"); //区一级
                 for (var i = drp2.options.length; i >= 0; i--) {
                     drp2.remove(i);
                 }
                 for (var i = drp3.options.length; i >= 0; i--) {
                     drp3.remove(i);
                 }
                 var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
                 var oDoc = new ActiveXObject("MSXML2.DOMDocument");
                 var province = document.getElementById("MProvince").value;
                 oHttpReq.open("post", "/aspx/selectarea.aspx?flag=1&province=" + province, false);
                 oHttpReq.setrequestheader("content-type", "application/x-www-form-urlencoded");
                 oHttpReq.send("");
                 var result = oHttpReq.responseText;
                 var newOption_0 = document.createElement("OPTION");
                 newOption_0.text = "-请选择-";
                 newOption_0.value = '0';
                 drp2.options.add(newOption_0);
                 oDoc.loadXML(result);
                 //这里要说一下，items1和items2是你在后面程序中得到的一个xml表。对于//NewDataSet/city/name是怎么来的，你可以用alert(result);看一下就行
                 items1 = oDoc.selectNodes("//NewDataSet/city/Title");
                 items2 = oDoc.selectNodes("//NewDataSet/city/Id");

                 var itemsLength = items1.length;

                 for (i = 0; i < itemsLength; i++)

                 //将小类的类名和编号赋予DropDownList2
                 {
                     var newOption = document.createElement("OPTION");
                     newOption.text = items1[i].text;
                     newOption.value = items2[i].text;
                     drp2.options.add(newOption);
                 }
             }


             function SelectMCity() {
                 var drp3 = document.getElementById("MArea");
                 for (var i = drp3.options.length; i >= 0; i--) {
                     drp3.remove(i);
                 }

                 var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
                 var oDoc = new ActiveXObject("MSXML2.DOMDocument");
                 var city = document.getElementById("MCity").value;
                 oHttpReq.open("post", "/aspx/selectarea.aspx?flag=2&city=" + city, false);
                 oHttpReq.setrequestheader("content-type", "application/x-www-form-urlencoded");
                 oHttpReq.send("");
                 var result = oHttpReq.responseText;
                 var newOption_0 = document.createElement("OPTION");
                 newOption_0.text = "-请选择-";
                 newOption_0.value = '0';
                 drp3.options.add(newOption_0);
                 oDoc.loadXML(result);
                 var items = oDoc.selectNodes("//NewDataSet/area");
                 for (var item = items.nextNode(); item; item = items.nextNode()) {
                     var areaName = item.selectSingleNode("Title").nodeTypedValue;
                     var areaCode = item.selectSingleNode("Id").nodeTypedValue;
                     var newOption = document.createElement("OPTION");
                     newOption.text = areaName;
                     newOption.value = areaCode;
                     drp3.options.add(newOption);
                 }
             }