function Ajax(){
	this.url = null;
	this.method = 'GET';
	this.async = true;
	this.status =null;
	this.statusText = '';
	this.postData = null;
	this.readyState = null;
	this.responseText = null;
	this.handleResp = null;
	this.responseFormat = 'text'; //'text','xml','object'
	this.mimeType = null;
	this.parameters='';
	
	this.init = function() {
		if(!this.req){
			try{
				//Try to create object for Fireforx,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 oject 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{
				this.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){
				//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);
				}
			}
		};
		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 you browser\'s '
			+ 'pop-up blocker.\n'
			+ 'Please allow pop-ups from this web site if you want to '
			+ 'see the full error message.\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.doGet = function (url,hand,format){
		this.url=url;
		this.handleResp = hand;
		this.responseFormat = format||'text';
		this.doReq();
	};
	
	this.doPost = function (url,parameters,hand,format,contenttype){
		this.url=url;
		this.parameters = parameters;
		this.handleResp = hand;
		this.responseFormat = format||'text';
		this.contenttype=contenttype;
		this.doReq();
	};
}