jQuery

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easing

Select an easing function from above menu. The box below will animate using that function and then a graph will appear showing that animation (black dots) against the ideal curve (white line). http://james.padolsey.com/demos/jquery/easing/
If you’ve ever needed to do more complex animations than fades and slides, then you’ve probably encountered the jQuery animate function . The animate function allows you quite a bit more flexibility than just using fadeOut or slideDown .

animate() step callback

http://cdmckay.org/blog/2010/03/01/the-jquery-animate-step-callback-function/