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The width and height of a flash object are set in the (x)HTML code. These can be accessed using JavaScript:
flashObject = document.getElementById('flashObjectID');
flashWidth = flashObject.width;
flashHeight = flashObject.height;
You need to do this at the client side, rather than at the server side, as there is no real access to the DOM from the server side.
HTH
Even if a flash developer gives the move canvas certain dimensions, that does not mean that those will be the sizes that the movie is rendered at.