This tutorial is a step by step guide on how to use the javascript QR Code scanner on a webcam video stream in browser. Some people reported experiencing problems including it in their own projets so I guess a tutorial might help others.
<html lang="en">
<head>
<script type="text/javascript" src="grid.js"></script>
<script type="text/javascript" src="version.js"></script>
<script type="text/javascript" src="detector.js"></script>