var xmlHttp;
function createXMLHttpRequest() {
	if (window.ActiveXObject) {
		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		if (window.XMLHttpRequest) {
			xmlHttp = new XMLHttpRequest();
		}
	}
}
function citysendRequest(url) {
	createXMLHttpRequest();
	xmlHttp.onreadystatechange = city;
	xmlHttp.open("GET", url, true);
	xmlHttp.send(null);
}
function onLoading() {
	var url = "/wuliu/pages/city/city.shtml?reservedAction=citylists";
	citysendRequest(url);
}
function city() {
	if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
		var dataObj = xmlHttp.responseXML;
		
//        var citysObj = dataObj.getElementsByTagName("citys")[0];
		var citysObj = dataObj.getElementsByTagName("citys")[0];
		var cityChild = citysObj.childNodes;
		var length = cityChild.length;
		var citySelect1 = document.getElementById("city1");
		var citySelect2 = document.getElementById("city2");
		for (var i = 0; i < length; i++) {
			
			var text = cityChild[i].getElementsByTagName("cityname")[0].firstChild.nodeValue;
			var optionObj1 = createOption0();
			var optionObj2 = createOption0();
			var optionText1 = document.createTextNode(text);
			var optionText2 = document.createTextNode(text);
			var optionValue = cityChild[i].getElementsByTagName("cityid")[0].firstChild.nodeValue;
			optionObj1.value = optionValue;
			optionObj1.appendChild(optionText1);
			
			optionObj2.value = optionValue;
			optionObj2.appendChild(optionText2);
			
			citySelect1.appendChild(optionObj1);
			citySelect2.appendChild(optionObj2);
		}
	}
}
function createOption0() {
	var optionObj = document.createElement("option");
	return optionObj;
}
function clear() {
	var citySelect = document.getElementById("city1");
	var citys = citySelect.childNodes;
	var length = citySelect.length;
	for (var i = 0; i < length; i++) {
		citySelect.removeChild(citys[0]);
	}
}