Trigger button click on uploadify flash object

I want to be able to trigg开发者_如何学运维er a click on the "Upload" button in Uploadify - the reason being I'd like to be able to choose to upload a file from a dropdown menu and hence need to call "Upload" somehow using javascript - unless anyone has another clever idea?

The following DOES NOT work:

$('#file_uploadUploader').trigger('click');

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hi take alook at this link you can call some javascript function using ExternalInterface a static class and the opposit is true :

http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/external/ExternalInterface.html