title: How to modify motion tracking in AS3
body: <p>I have this amazing tutorial at <a href="http://www.computerarts.co.uk/tutorials/build-your-own-motion-tracking-system">http://www.computerarts.co.uk/tutorials/build-your-own-motion-tracking-system</a>
  In the developer version, the tracker moves along the X-axis. I want it to stay stationary rather than moving and when the object from the webcam comes in front of it. The stationary cross mark should be able to trigger an event preferably a sound when anybody is in front of it.
  Would be grateful for the help I get. I am a complete noob in AS. If you have any other tutorial and link me to it I would appreciate it. </p>