How to detect if my SWF was successfully retrieved or not?

Question

Hi All,
We have a full-viewport Flex app that is integral to our business.  "Full-viewport" means that there is nothing else on the page--the Flex app uses the entire viewport.
The app was developed in Flash Builder 4, and we're using the default HTML/JavaScript that Flash Builder provides for the host page that SWF lives on.  This is using SWFObject.
From time to time, we get calls from customers who try to use our Flex app and instead get a completely blank page. The only way I can replicate this myself is if I do something to prevent the SWF from downloading.  E.g., if I change the name of the SWF so that SWFObject gets a 404.
The best guess I can give as to why customer's might get this behavior is that they've got some kind of security software that is blocking SWFs, or at least blocking this particular SWF.
I am wondering how I can tell, in JavaScript, whether or not the SWF was successfully loaded by SWFObject.  I would like to display a notice to the user saying that the Flash file failed to download, and giving them some suggestions on how to get it to download (e.g., check security software settings, unblock Flash, etc.).  I would then also send a notification to myself notifying me that we had a "blank screen" incident, along with some debugging information about the client's browser.
If there was a way for me to know in JavaScript the results of the SWFObject embed attempt, I think I could do this.  Suggestions?
  -Josh

Answer 1

Well, an issue I've run into is that since my Flex app is full-viewport, there's nowhere for me to display an HTML message.  The Flash move displays on top of everything as usual.
So, even if I were able to work out a way to determine if the SWF failed to load, I wouldn't be able to display it.  But I suppose I could redirect the user to another page where I gave them some useful troubleshooting information.
Any any rate, this got me thinking--why is Flash movie displaying on top of everything--even if I delete the SWF file, so there is no Flash movie to download.  Hmm... right click on the big white viewport, and you get "Movie not loaded" in the Flash Player context menu.
So, even though the Flash move is not loaded, the Flash Player did start.  Which leads me to ask... is there a way to interrogate the Flash Player directly, and see if it loaded the movie or not?
Clearly the Flash Player is aware that the SWF failed to download.  It tells me right in the context menu, "movie not loaded."  The question is, can I programmatically interrogate the Flash Player from within JavaScript?
Suggestions?
p.s., I'm aware that I could change the WMODE to transparent to try and let my HTML message show through the SWF, but I want to avoid doing that at all costs :-) I've had too many problems in the past with subtle (and frustrating) errors when I change WMODE away from the default value of Window.