function Ajax() {
	this.req = null;
	this.url = null;
	this.method = 'GET';
	this.async = true;
	this.status = null;
	this.statusText = '';
	this.postData = null;
	this.readyState = null;
	this.responseText = null;
	this.responseXML = null;
	this.handleResp = null;
	this.responseFormat = 'text', // 'text', 'xml', or 'object'
	this.mimeType = null;
	//
	this.init = function()
	{
		if (!this.req)
		{
			try 
			{
				// Try to create object for Firefox, Safari, IE7, etc.
				this.req = new XMLHttpRequest();
			}
			catch (e) 
			{
				try
				{
					// Try to create object for later versions of IE.
					this.req = new ActiveXObject('MSXML2.XMLHTTP');
				}
				catch (e)
				{
					try
					{
						 // Try to create object for early versions of IE.
						 this.req = new ActiveXObject('Microsoft.XMLHTTP');
					}
					catch (e) 
					{
						 // Could not create an XMLHttpRequest object.
						 return false;
					}
				}
			}
		}
		return this.req;
	};
	this.doReq = function()
	{
		if (!this.init())
		{
			alert('Could not create XMLHttpRequest object.');
			return;
		}
		this.req.open(this.method, this.url, this.async);
		if (this.mimeType)
		{
			try
			{
				req.overrideMimeType(this.mimeType);
			}
			catch (e)
			{
				// couldn't override MIME type  --  IE6 or Opera?
			}
		} 
		var self = this; // Fix loss-of-scope in inner function
		if(this.async)
		{
			this.req.onreadystatechange = function()
			{
				if (self.req.readyState == 4) {
					switch (self.responseFormat)
					{
						 case 'text':
						   resp = self.req.responseText;
						   break;
						 case 'xml':
						   resp = self.req.responseXML;
						   break;
						 case 'object':
						   resp = req;
						   break;
					}
					if (self.req.status >= 200 && self.req.status <= 299)
					{
						self.handleResp(resp);
					}
					else
					{
						self.handleErr(resp);
					}
				}
			};
		}
		this.req.send(this.postData);
		if(!this.async)
		{
			switch (this.responseFormat)
			{
				 case 'text':
				   resp = this.req.responseText;
				   break;
				 case 'xml':
				   resp = this.req.responseXML;
				   break;
				 case 'object':
				   resp = req;
				   break;
			}
			if (self.req.status >= 200 && self.req.status <= 299)
			{
				if(this.handleResp)
				{
					this.handleResp(resp);
				}
				else
				{
					return(resp);
				}
			}
			else
			{
				this.handleErr(resp);
			}
		}
	};
	this.setMimeType = function(mimeType)
	{
		this.mimeType = mimeType;
	};
	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. This is probably because of your browser\'s '
			 + 'pop-up blocker.\n'
			 + 'Please allow pop-ups from this web site if you want to '
			 + 'see the full error messages.\n'
			 + '\n'
			 + 'Status Code: ' + this.req.status + '\n'
			 + 'Status Description: ' + this.req.statusText);
		}
	};
	this.setHandlerErr = function(funcRef)
	{
		this.handleErr = funcRef;  
	};
	this.setHandlerBoth = function(funcRef)
	{
		 this.handleResp = funcRef;
		 this.handleErr = funcRef;
	};
	this.abort = function()
	{
		if (this.req)
		{
			this.req.onreadystatechange = function() { };
			this.req.abort();
			this.req = null;
		}
	};
	this.doGet = function(url, hand, format)
	{
		this.url = url;
		this.handleResp = hand;
		this.responseFormat = format || 'text';
		return(this.doReq());
	};
}