The HTML5 Behaviour Trees Plugin allows you to easily create customizable behaviour trees for your games. This powerful and easy-to-understand artificial intelligence system establishes a core framework which will help you build your trees.
Behavior trees (BTs) are deployed by more and more game AI programmers to implement reactive decision making and control to the virtual creatures developed within their game. For more information about behavior trees see these links:
http://www.altdevblogaday.com/2011/02/24/introduction-to-behavior-trees/