How to get the selected item of ComboBox of actionscript 3 by javascript?

Can someone provide an example how to do this?

UPDATE

I know how to get the selected item in actionscript,but my que开发者_如何学Pythonstion is how to get it in javascript?

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Get the selected item in AS3 and pass it out to javascript using External Interface: http://www.actionscript.org/resources/articles/638/1/Basics-of-using-the-ExternalInterface/Page1.html