function initxmlhttp() {
	var xmlhttp;
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			xmlhttp = false;
		}
	}
	if (!xmlhttp && typeof XMLHttpRequest != 'undefiend') {
		try {
			xmlhttp = new XMLHttpRequest();
		} catch (e) {
			xmlhttp = false;
		}
	}
	if (!xmlhttp && window.createRequest) {
		try {
			xmlhttp = window.createRequest();
		} catch (e) {
			xmlhttp = false;
		}
	}
	return xmlhttp;
}


/*************************
*城市的一个查询函数
*
*********************************************************/
function queryCity(citycode,cityname,areaname,urls){//执行程序查询，查询城市的
    if(citycode==''){
        document.getElementById(cityname+"s").innerHTML='<select name="'+cityname+'" id="'+cityname+'"><option value="" selected>请选择城市</option></select>';
        document.getElementById(areaname+"s").innerHTML='<select name="'+areaname+'" id="'+areaname+'"><option value="" selected>请选择区域</option></select>';

    }
    else{
    xmlhttp = initxmlhttp() ;
	var url =urls+'?father='+citycode+'&cityname='+cityname+'&areaname='+areaname+'&op=1&n='+Math.random();
	xmlhttp.open('GET', url, true);
	xmlhttp.onreadystatechange = function () {
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                var arr=xmlhttp.responseText.split(',,');
				document.getElementById(cityname+"s").innerHTML=arr[0];
				document.getElementById(areaname+"s").innerHTML=arr[1];
            }
		}
        xmlhttp.send(null);
    }

	
}
/*********************
*县区的一个查询函数
***********************************************************/
function queryArea(citycode,areaname,urls){//查询程序

	xmlhttp = initxmlhttp() ;
	var url =urls+'?father='+citycode+'&areaname='+areaname+'&op=2&n='+Math.random();
	xmlhttp.open('GET', url, true);
	xmlhttp.onreadystatechange = function () {				
			if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
				document.getElementById(areaname+"s").innerHTML=xmlhttp.responseText;
			}		
		}
	xmlhttp.send(null);		
}

function queryonlyCity(citycode,cityname,urls){//执行程序查询，查询城市的
    if(citycode==''){
        document.getElementById(cityname+"s").innerHTML='<select name="'+cityname+'" id="'+cityname+'"><option value="" selected>请选择城市</option></select>';
    }
    else{
        xmlhttp = initxmlhttp() ;
        var url =urls+'?father='+citycode+'&cityname='+cityname+'&op=3&n='+Math.random();
        xmlhttp.open('GET', url, true);
        xmlhttp.onreadystatechange = function () {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    document.getElementById(cityname+"s").innerHTML=xmlhttp.responseText;
                }
            }
        xmlhttp.send(null);
    }
}

function queryonlyCitys(citycode,cityname,urls){//执行程序查询，查询城市的
    if(citycode==''){
        document.getElementById(cityname+"s").innerHTML='<select name="'+cityname+'" id="'+cityname+'" class="select_c"><option value="" selected>请选择城市</option></select>';
    }
    else{
        xmlhttp = initxmlhttp() ;
        var url =urls+'?father='+citycode+'&cityname='+cityname+'&op=4&n='+Math.random();
        xmlhttp.open('GET', url, true);
        xmlhttp.onreadystatechange = function () {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    document.getElementById(cityname+"s").innerHTML=xmlhttp.responseText;
                }
            }
        xmlhttp.send(null);
    }
}