Untitled

<html>
	<head>
	</head>
	<body>
		<canvas id="canvas" width="500" height="500">Canvas tag not supported!</canvas>
		<script>
			var b_canvas = document.getElementById("canvas");
			var b_context = b_canvas.getContext("2d");
			var x = 0;
			setInterval(function () {
				b_canvas.width = b_canvas.width;
				b_context.fillRect(x, 25, 150, 100);
				x++;

				b_context.fillRect(0, 0, 500, 2);
				b_context.fillRect(0, 0, 2, 500);
				b_context.fillRect(498, 0, 2, 500);
				b_context.fillRect(0, 498, 500, 2);
			}, 10);
			setInterval(function () {x = 0;}, 2000);
		</script>
	</body>
</html>