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 = 'xml';
	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
    	this.req.onreadystatechange = function() {
    		var resp = null;
    		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);
    };

    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 = "https://host.harrishost.com/~crstrip/" + url;
        this.url = url;
//prompt("url:", this.url);
        this.handleResp = hand;
        this.responseFormat = format || 'xml';
        this.doReq();
    };
}