Is there a program or a website that will let me flash an image for 200 msec?

What does 'flash an image' mean? You mean so that it looks like it's fading in and out real fast showing a 'flash' technique?

If so, that is VERY easy, lightweight and portable..

http://api.jquery.com/fadeIn/

http://api.jquery.com/fadeOut/
 
You could create an animated GIF that has exactly three frames, where the first and third frame is blank. Set the timing on the first frame to some arbitrary number of seconds, set the second frame to half a second, and set it up so that it doesn't repeat.

There are numerous applications that will create an animated GIF, including Gimp with the Gap plug-in.
 
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