function Ajax()
{
	this.req = null;
	this.reqId = 0;
	this.url = null;
	this.status = null;
	this.statusText = '';
	this.method = 'GET';
	this.async = true;
	this.dataPayload = null;
	this.readyState = null;
	this.responseText = null;
	this.responseXML = null;
	this.handleResp = null;
	this.responseFormat = 'text', // 'text', 'xml', 'object'
	this.mimeType = null;
	this.headers = [];
	var ld = null;

	var i = 0;
	var reqTry = [ 
	function() { return new XMLHttpRequest(); },
	function() { return new ActiveXObject('Msxml2.XMLHTTP') },
	function() { return new ActiveXObject('Microsoft.XMLHTTP' )} ];

	while (!this.req && (i < reqTry.length))
	{
		try
		{
			this.req = reqTry[i++]();
		}
		
		catch(e)
		{}
	}
	
	if (this.req)
	{
		this.reqId = 0;
	}
	
	else
	{
		alert('Could not create XMLHttpRequest object.');
	}

	this.doGet = function(url, hand, div, format)
	{
		this.url = url;
		this.handleResp = hand;
		this.responseFormat = format || 'text';
		ld = div;
		doLoad(ld);
		return this.doReq();	
	}
	
	this.doPost = function(url, dataPayload, hand, format)
	{
		this.url = url;
		this.dataPayload = dataPayload;
		this.handleResp = hand;
		this.responseFormat = format || 'text';
		this.method = 'POST';
		return this.doReq();
	}
	
	this.doReq = function()
	{
		var self = null;
		var req = null;
		var id = null;
		var headArr = [];

		req = this.req;
		this.reqId ++;
		id = this.reqId;
		
		req.open(this.method, this.url, this.async);
		
		if (this.mimeType && navigator.userAgent.indexOf('MSIE') == -1)
		{
			req.overrideMimeType(this.mimeType);
		}
		
		if (this.headers.length)
		{
			for (var i = 0 ; i < this.headers.length ; i++)
			{
				headArr = this.headers[i].split(': ');
				req.setRequestHeader(headArr[i], headArr[1]);
			}
			
			this.headers = [];
		}

		else
		{
			if (this.method == 'POST')
			{
				req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
			}
		}
		
		self = this; // Fix loss-of-scope in inner function
		
		req.onreadystatechange = function()
		{
			var resp = null;
			self.readyState = req.readyState;
			
			if (req.readyState < 4)
			{
				//doLoad(ld);
			}
			
			else if (req.readyState == 4)
			{
				self.status = req.status;
				self.statusText = req.statusText;
				self.responseText = req.responseText;
				self.responseXML = req.responseXML;
				
				switch(self.responseFormat)
				{
					case 'text':
					  resp = self.responseText;
					break;

					case 'xml':
					  resp = self.responseXML;
					break;

					case 'object':
					  resp = req;
					break;
				}
		
				if (self.status > 199 && self.status < 300)
				{
					if (self.async)
					{
						if (!self.handleResp)
						{
							alert('No response handler defined ' +
							'for this XMLHttpRequest object.');
							return;
						}
						
						else
						{
							self.handleResp(resp, id);
						}
					}
				}
				
				else
				{
					self.handleErr(resp);
				}
			}
		
		}

		req.send(this.dataPayload);
		
		if (this.async)
		{
			return id;
		}
	
		else
		{
			return req;
		}
	}

	this.abort = function()
	{
		if (this.req)
		{
			this.req.onreadystatechange = function()
			{
			}
			
			this.req.abort();
			this.req = null;
		}
	}
	
	this.handleErr = function()
	{
		var errorWin;

		try
		{
			//errorWin = window.open('', 'errorWin');
			//errorWin.document.body.innerHTML = this.responseText;
		}

		catch(e)
		{
			/*alert('An error occurred, but the error message cannot be' +
			' displayed because of your browser\'s pop-up blocker.\n' +
			'Please allow pop-ups from this Web site.');*/
		}
	}
	
	this.setMimeType = function(mimeType)
	{
		this.mimeType = mimeType;
	}
	
	this.setHandlerResp = function(funcRef)
	{
		this.handleResp = funcRef;
	}
	
	this.setHandlerErr = function(funcRef)
	{
		this.handleErr = funcRef; 
	}
	
	this.setHandlerBoth = function(funcRef)
	{
		this.handleResp = funcRef;
		this.handleErr = funcRef;
	}
	
	this.setRequestHeader = function(headerName, headerValue)
	{
		this.headers.push(headerName + ': ' + headerValue);
	}
	
	function doLoad(divid)
	{
		document.getElementById(divid).innerHTML = '<div align="center"><br /><img src="http://www.backtobasicsdesign.co.uk/peterhill/site/images/loader.gif" alt="Please wait..." title="Please wait..." border="0" /></div>';
	}
}