		w.requestAnimFrame = (function () {
				return  w.requestAnimationFrame ||
					w.webkitRequestAnimationFrame ||
					w.mozRequestAnimationFrame ||
					w.oRequestAnimationFrame ||
					w.msRequestAnimationFrame ||
					function (callback) {
						w.setTimeout(callback, 1000 / 60);
					};
			})();
			
			
			/*
			 * the main Quadtree
			 */
			var myTree = new Quadtree({
				x: 0,
				y: 0,
				width: 640,
				height: 480
			});
			
			/*
			 * our objects will be stored here
			