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TweenLite is a tweening engine that was developed with the focus keeping its filesize as low as possible.

It is almost incredible, but it adds only 2kb to your projects. If you are creating flash web banners and their size should be small, this tweening engine is a must.

Despite the small size you can use features like delays, callbacks, pass custom arguments to the callback functions and use it in project of any scale (also the large ones).

There is also a lightweighted Filter Tweening extension.

If you are using AS2, there is also AS2 version.