I got the answer to this on another board, here it is in case anyone else is trying to do the same thing:
In your publish settings, check off HTML, SWF & either JPG OR Gif.
Then in the html tab. Select Detect Flash.
Then publish the file.
It will write a javascript that dectes for flash. If flash isn't available, it will try to auto-install. If it can't, it will display an image. If they don't have javascript enabled, it will also display the image.
It's cake if you let flash write the code for you.
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