[Tweener] tweening alpha

[Iker Lopez de Audikana]

I have this code:

Tweener.addTween("foto"+[i],{alpha:1, transition: "easeInOutSine", time:2, delay: 2, onComplete:Prueba}

and I get this error:

ReferenceError: Error #1069: Could not find alpha property in String and there is not a default value.

Sorry for the translation, my flash CS4 is in Spanish.

thank you.
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