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jquery effects accessible?

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From: Jonathan Pund
Date: Dec 19, 2013 7:18AM

I have an app that is using the "pulsate" jquery effect (http://api.jqueryui.com/pulsate-effect/). Here's the context: the user needs to choose ten items from a pool, and does so by click on the button corresponding to the item. When the list is full, if the user clicks on another button in the pool, it pulsates to convey that it cannot be moved and that the list is full. These are my questions:
1) Is this effect accessible "straight out of the box" from the jquery package? Or do I need to make some additions to the code to make is accessible?
2) Does this violate 508 or any other accessibility mandate by only conveying the user "error" with a visual effect? I know that would be the case if you were using only color or only sound, but what about only a visual effect?

Thanks in advance,
Jonathan