function ninja(url, callbackFunction) {
	var that = this;
	this.updating = false;

	this.change_url = function(new_url) {
		this.abort();
		urlCall = new_url;
	}

	this.abort = function() {
		if (that.updating) {
			that.updating = false;
			that.AJAX.abort();
			that.AJAX = null;
		}
	}

	this.update = function(passData, postMethod) {
		if (that.updating) return false;

		that.AJAX = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");

		if (that.AJAX == null)
			return false;
		else {
			that.AJAX.onreadystatechange = function() {
				if (that.AJAX.readyState == 4) {
					that.updating = false;
					that.callback(that.AJAX.responseText, that.AJAX.status, that.AJAX.responseXML);
					that.AJAX = null;
				}
			}
			that.updating = new Date();
			if (/post/i.test(postMethod)) {
				var uri = urlCall + '?' + that.updating.getTime();
				that.AJAX.open("POST", uri, true);
				that.AJAX.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
				that.AJAX.setRequestHeader("Content-Length", passData.length);
				that.AJAX.send(passData);
			} else {
				var uri = urlCall + '?' + passData + '&timestamp=' + (that.updating.getTime());
				that.AJAX.open("GET", uri, true);
				that.AJAX.send(null);
			}
			return true;
		}
	}

	var urlCall = url;
	this.callback = callbackFunction || function () { };
}