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I haven’t used flash for a while, and today while creating little news slider in flash which communicate with Javascript (and vice versa), i lost 30 min to find the best way to communicate between Flash and Javascript. So to save you a lot of time here is simple description.

To Call Javascript function from Flash:

import flash.external.ExternalInterface;
...
ExternalInterface.call("my_js_function()");

To get a return value:

var el_width:int = ExternalInterface.call("get_width()");

To pass an argument try:

var el_width:int = ExternalInterface.call("get_width()", "my_el_id");

And that’s it

Communication with flash from javascript is a little bit harder, but if you follow these steps it sholud work.
To Communicate with Flash from Javascript you need to adjust 3 different thing HTML, JS, AS.

First HTML

The