Terminate a loop once a file is not found

I have a loop that is running to display images of all my clients.

So, the image names are client0.png, client1.png,client2.png and so forth.

I have a movie clip that is duplicated and uses the Loadmovie command to call the images. The code I’m using looks like this.

var position = 0;
for (i=0; i<50; i++) {
emptyMC.duplicateMovieClip(“emptyMC”+i, i, {_y:+position});
var position = position +150
loadMovie (“http://www.url.com/client"+i+".png”, “emptyMC”+i);

It’s working great! But I don’t have 50 clients, so I was wondering if there was a way to terminate this loop once it was unable to find a file. Does it already terminate once the file isn’t found? Every time I test, the output unfortunately tells me “file cannot be found blah blah blah” or whatever. And all I want to do in order to update this page is to upload another image to the server without going back into the .swf and changing the i<50 to the exact number of clients I have. Perhaps I’m going about this the wrong way? Hopefully you guys can help. Thanks!