var xmlHttp = createXmlHttpRequestObject();
var serverAddress = "validator.php";
var showErrors = true;
var cache = new Array();

function createXmlHttpRequestObject() {
	
	var xmlHttp;
	try {
		xmlHttp = new XMLHttpRequest();
	}
	catch(e) {
		var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0", "MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
										"MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP");
		
		for (var i = 0; i < XmlHttpVersions.length && !xmlHttp; i++) {
			try {
				xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
			}
			catch(e) {}
		}
	}
	if (!xmlHttp)
		displayError("Błąd podczas tworzenia obiektu XMLHttpRequest.");
	else
		return xmlHttp;
}

function displayError($message) {

	if (showErrors) {
		showErrors = false;
		alert("Wystapil bład: \n" + $message);
		setTimeout("validate();", 10000);
	}
}

function validate(inputValue, fieldID) {

	if (xmlHttp) {
		if (fieldID) {
			inpuValue = encodeURIComponent(inputValue);
			fieldID = encodeURIComponent(fieldID);
			cache.push("inputValue=" + inputValue + "&fieldID=" + fieldID);
		}
		try {
			if((xmlHttp.readyState == 4 || xmlHttp.readyState == 0) && cache.length > 0) {
				var cacheEntry = cache.shift();
				xmlHttp.open("POST", serverAddress, true);
				xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
				xmlHttp.onreadystatechange = handleRequestStateChange;
				xmlHttp.send(cacheEntry);	
			}
		}
		catch(e) {
			displayError(e.toString());
		}
	}
}

function handleRequestStateChange() {

	if(xmlHttp.readyState == 4) {
		if(xmlHttp.status == 200) {
			try {
				readResponse();
			}
			catch(e) {
				displayError(e.toString());
			}
		}
		else {
			displayError(xmlHttp.statusText);
		}
	}
}

function readResponse() {

	var response = xmlHttp.responseText;
	
	if(response.indexOf("ERRNO") >= 0 || response.indexOf("error:") >= 0 || response.length == 0)
		throw(response.length == 0 ? "Server error." : response);
	responseXml = xmlHttp.responseXML;
	xmlDoc = responseXml.documentElement;
	result = xmlDoc.getElementsByTagName("result")[0].firstChild.data;
	fieldID = xmlDoc.getElementsByTagName("fieldid")[0].firstChild.data;
	message = document.getElementById(fieldID + "Failed");
	message.className = (result == "0") ? "error" : "hidden";
	setTimeout("validate();", 500);
}

function setFocus() {

	document.getElementById("txtQponName").focus;
}