ajax = Class.create();
ajax.prototype = {
	initialize: function(){
		return this;
	},
	
	init: function(){
		this.transport   = this.getTransport();
		this.postBody    = '';
		this.method      = 'post';
		this.onComplete  = null;
		this.update      = null;
		this.afterUpdate = null;	
	},

	request: function(url){
		this.transport.open(this.method, url, true);
		this.transport.onreadystatechange = this.onStateChange.bind(this);
		if (this.method == 'post') {
			this.transport.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
			if (this.transport.overrideMimeType) this.transport.setRequestHeader('Connection', 'close');
		}
		this.transport.send(this.postBody);
		
	},

	onStateChange: function(){
		if (this.transport.readyState == 4 && this.transport.status == 200) {
			if (this.onComplete) 
				setTimeout(function(){this.onComplete(this.transport);}.bind(this), 10);
			if (this.update) {
				setTimeout(function(){this.update.innerHTML = this.transport.responseText;}.bind(this), 10);
			}
			if (this.afterUpdate)
				setTimeout(function(){this.afterUpdate(this.transport);}.bind(this), 10);

			this.transport.onreadystatechange = function(){};
		}
	},

	getTransport: function() {
		if (window.ActiveXObject) return new ActiveXObject('Microsoft.XMLHTTP');
		else if (window.XMLHttpRequest) return new XMLHttpRequest();
		else return false;
	}
	
};