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.method == 'POST' ) {
			this.req.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");
		}
		var self = this; // Fix loss-of-scope in inner function
		this.req.onreadystatechange = function() {
			if (self.req.readyState == 4) {
				// Do stuff to handle response
				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);
					//alert(self.req.responseText);
					alert(self.errText);
				}
			}
		}
		this.req.send(this.postData);
	}
	
	this.handleErr = function() {
		var errorWin;
		try {
			errorWin = window.open('', 'errorWin');
			errorWin.document.body.innerHTML = this.req.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.abort = function() {
		if (this.req) {
			this.req.onreadystatechange = function() { };
			this.req.abort();
			this.req = null;
		}
	}
	
	this.doPost = function(url, postdata, hand, format,errtxt) {
		this.url = url;
		this.method = 'POST';
		this.handleResp = hand;
		this.postData = postdata;
		this.errText = errtxt;
		this.responseFormat = format || 'text';
		this.doReq();
	}
	this.doGet = function(url, hand, format) { 
		this.url = url; 
		this.handleResp = hand; 
		this.responseFormat = format || 'text'; 
		this.doReq(); 
	}
}