AjaxUtility = function() {
	/* AjaxUtility */
	this.xhr = new XMLHttpRequest();
}
AjaxUtility.prototype = {
	get : function(url, callback) {
		var _this = this;
		this.xhr.onreadystatechange  = function() {
			if (_this.xhr.readyState == 4) {
				switch (_this.xhr.status) {
					case 200:
						callback(_this.xhr.responseText);
					break;
					case 404:
						callback("AJAX ERROR: 404 - url not found.");
					break;
				}
			}
		}
		this.xhr.open("GET", url);
		this.xhr.send();
	}
}