can i test for allegro gfx mode?

I'm working on a casino game, and I want to switch from console to FULLSCREEN_AUTODETECT to play movies of slot machines and roulette wheels and such. The problem is that the first few seconds of the movie go unseen while set_gfx_mode() does its thing. Is there any way to test to see if the program has switched to fullscreen before I start the movie, or should I just put in something like:

Code:

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set_gfx_mode(GFX_AUTODETECT_FULLSCREEN,800,600,0,0);
 rest(5000);
 drawboard();

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I'd rather know when it switches in so that the user won't have to wait for the movie/skip the first part. Thanks.
(code attached)

Try asking here.

Code:

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if(set_gfx_mode(GFX_AUTODETECT_FULLSCREEN, 800, 600, 0, 0) == 0)
 {
  drawboard();
 }

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The drawboard() function shouldn't start until after the gfx mode has been set.