function newAjax(){
	var xmlhttp=false;
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
	try {
		xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (e) {
		xmlhttp = false;
	}
	}
	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}

function callAjax(callback, paramsGET){
	urlServlet = "/engineServlet.php";
	
	var xmlhttp = newAjax();
	xmlhttp.open("GET", urlServlet+paramsGET);
	
	xmlhttp.onreadystatechange=function() {
	
		if (xmlhttp.readyState==4 && xmlhttp.status==200) {
			if(callback!=null) callback(xmlhttp);
		}
	}
	xmlhttp.send(null);
	return (false);
}


function refreshSelectRegion(selfObject, fieldId){

	var selectElement = document.getElementById(fieldId);
	if(selectElement){
		 selectElement.options.length = 1;
		 
		 if(selfObject.value!="0"){
			 var paramsGET = "?func=selectRegiones&idPais="+selfObject.value+"&fieldId="+fieldId;
			 callAjax(callbackSelect, paramsGET);
		 }
	}
}

function refreshSelectType(selfObject, fieldId){

	var selectElement = document.getElementById(fieldId);
	if(selectElement){
		selectElement.options.length = 1;
		
		if(selfObject.value!="0"){
			var paramsGET = "?func=selectTipo&idTipo="+selfObject.value+"&fieldId="+fieldId;
			callAjax(callbackSelect, paramsGET);
		}
	}
}

function callbackSelect(xmlhttp){
	var fieldId = xmlhttp.responseXML.getElementsByTagName("data")[0].getAttribute("fieldId");
	var selectElement = document.getElementById(fieldId);
	var options = xmlhttp.responseXML.getElementsByTagName("option");
	for(i=0; i< options.length; i++){
		 var id = options[i].getAttribute("id");
		 var label = unescape(options[i].getAttribute("label"));
		 var currentId = selectElement.options.length;
		 selectElement.options[currentId] = new Option(label, id);
	
	}
}