Sigmoid functions based upon work by Emmanuel Pietriga. wobble and spring come from, or are loosely based on Scriptaculous.

Animation is a Template that passes a position to its run( pos ) method. (you implement run).

anim.Transitions contains effects for speed/timing, such as acceleration and easing.

 
b = new APE.anim.Animation( "blah" );
b.run = function(position) { // <-- you implement run.

};
b.start(); // <-- then call start.