In this tutorial, you will learn the basics of architecting a simple Line Effect, using Flash CS4 or Flex Builder 3. We try to cover the basics on the simplest way, so everyone will be able to step in the scripted animation with actionscript 3.0. The fact of using only code to generate animation and effects, will result on a very small file size, which will improve the loading performance on the browser and enables a better interactivity experience.

This is description that the http://www.thetechlabs.com/ makes for this tutorial. Well, this tutorial is made by me and if you want to learn something new , have a look - Click for Tutorial-.
And the final result you can see here: