//================== AJAX =================================================
var xmlHttp = createXmlHttpRequestObject();
var serverAddress = "updatesessionvar.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("Error creating the XMLHttpRequest object.");
	else
	return xmlHttp;
}
function displayError($message)
{
	if (showErrors)
	{
		showErrors = false;
		alert("Error encountered: \n" + $message);
		setTimeout("validate();", 10000);
	}
}
function UpdateSessionVar(inputVar)
{
	if (xmlHttp)
	{
		inputType=inputVar.type;
		if (inputType=="checkbox")
		{
			if (inputVar.checked)
			inputValue="on";
			else
			inputValue="off";
		}
		else
		{
			inputValue=inputVar.value;
		}
		fieldID=inputVar.id;
		//alert(inputType);
		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 = handleRequestStateChange;
				xmlHttp.send(cacheEntry);
				//alert("UpDateSessionVar sent this to the server: inputValue=" + inputValue + "&fieldID=" + fieldID);
			}
		}
		catch (e)
		{
			displayError(e.toString());
		}
	}
}
function handleRequestStateChange()
{
	if (xmlHttp.readyState == 4)
	{
		if (xmlHttp.status == 200)
		{
			try
			{
				//readResponse(); //no response necessary
			}
			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);
}

//====================== JQUERY ==================