= -1) return;

			var promptWin = document.getElementById('instructionPrompt');
			if(step == undefined){
				step = 0;
				promptWin.style.display = 'inline-block';
				promptWin.style.opacity = 0.1;
				setTimeout(function(){fadeTo(promptWin, 1);}, 50);
			}

			setTimeout(function(){
				fadeTo(promptWin, 0, function(){
					promptWin.style.display = 'none';
				});
			}, 3000);
		}

		function animate(){
			var n;
			context.clearRect(0, 0, canvasWidth, canvasHeight);
			for(n = 0; n < numShapes; n++){
