// JavaScript Document


//////////////////////////// AJAX //////////////////////////////////////////

//Holds an instance of XMLHttpRequest

var xmlHttp = createXmlHttpRequestObject();

//Hosts the remote server address

var serverAddress = "get_form.php";

// When set to true, display detailed error messages

var showErrors = true;

// initialize validation request cache

var cache = new Array();

// creates an XMLHttpRequest instance

function createXmlHttpRequestObject()

{
	
	// will store the reference to the XMLHttpRequest object
	
	var xmlHttp;
	
	// this should work for all browsers except IE6 and older
	
	try
	
	{
		
		// try to create XMLHttpRequest object
		
		xmlHttp = new XMLHttpRequest();
		
	}
	catch(e)
	{
		// assume IE6 or older
		
		var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
										"MSXML2.XMLHTTP.5.0",
										"MSXML2.XMLHTTP.4.0",
										"MSXML2.XMLHTTP.3.0",
										"MSXML2.XMLHTTP",
										"Microsoft.XMLHTTP");
		
		// try every id until one works
		
		for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++)
		{
			try
			{
				// try to create XMLHttpRequest
				
				xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
			}
			catch(e) {} // ignore potential error
		}
	}
	
	// return the created object or display an error message
	
	if(!xmlHttp)
		displayError("Error creating the XMLHttpRequest object.");
	else
		return xmlHttp;
}

// function that displays an error message

function displayError($message)
{
	// ignore errors if show errors is false
	
	if (showErrors)
	{
		// turn error displaying off
		
		showErrors = false;
		
		// display error message
		
		alert("Error encountered: \n" + $message);
		
	}
}

//////////////////////////// AJAX //////////////////////////////////////////