var xmlHttp = createXmlHttpRequestObject();
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("Error creating the XMLHttpRequest object.");
	else
		return xmlHttp;
}

function displayError($message)
{
	if (showErrors)
	{
		showErrors = false;
		alert("Error encountered: \n" + $message);
		setTimeout("validate_dinamic_form();", 10000);
	}
}

function validate_dinamic_form(inputValue, fieldID)
{
	var serverAddress = document.getElementById("url").innerHTML;

	if (xmlHttp)
	{
		if (fieldID)
		{
			inputValue = 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 = handleFormRequestStateChange;
				xmlHttp.send(cacheEntry);
			}
		}
		catch (e)
		{
			displayError(e.toString());
		}
	}
}

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

function readFormResponse()
{
	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_dinamic_form();", 500);
}