Random alpha using actionscript

Hi

I have a world map created from individual circles in Illustrator, I need to take this into Flash and fade the circles in randomly to create the map.

The map is made up of 100s of circles so obviously I want to avoid creating 100s of instances of the same movie clip and positioning them randomly on the timeline.

I am looking for any advice on the best way to achieve this using actionscript.

If the fading of the circles could be random each time the movie loads this would be a bonus but it’s not a necessity.

Any help is much appreciated

Thanks