var xmlHttp;
var requestType="";
function createXMLHttpRequest()
{
	if(window.ActiveXObject)
	{
		xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	else if(window.XMLHttpRequest)
	{
		xmlHttp=new XMLHttpRequest();
	}
}
function queryCity(citycode){
	createXMLHttpRequest();
	type="city";
	var url="../city/city.php?provincecode="+citycode;
	xmlHttp.open("GET",url,true);
	xmlHttp.onreadystatechange=handleStateChange;
	xmlHttp.send(null);
}

function queryArea(citycode){
	createXMLHttpRequest();
	type="area";
	var url="../city/city.php?citycode="+citycode;
	xmlHttp.open("GET",url,true);
	xmlHttp.onreadystatechange=handleStateChange;
	xmlHttp.send(null);
}

function handleStateChange(){
	if(xmlHttp.readystate==4){
		if(xmlHttp.status==200){
			if(type=="city"){
				showcity();
			}else if(type="area"){
				showarea();
			}
		}
	}
}

function showcity(){
	document.getElementById("city").innerHTML=xmlHttp.responseText;
	document.getElementById("area").innerHTML="";
}
function showarea(){
	document.getElementById("area").innerHTML=xmlHttp.responseText;
}