radom_flash5smBesides using Javascript to do a random select, i came across and found a easy solutoin simply using actionscript to ramdom select the .swf files. AS 2.0 code as below:

filename = ["file1.swf", "file2.swf", "file3.swf", "file4.swf", "file5.swf"];
path = “http://www.yourdomain”;
i = filename.length;
k = Math.floor(Math.random()*i);
loadMovie(path+filename[k], container);

* you need to make another layer with movie clip and put the instance name as ”container” to control where the random files display.

See below for more detail:

1. New document or existing .fla –> make a new Layer and on the first frame hit F9 for actionscript. 
radom_flash1sm

 

2. Insert the code above to the actionscript, i have two files for random display.
radom_flash2sm

3.Create another new layer.
4.Create a New Symbol and make it as a movie clip. (This is to make a container/placeholder, where the random files will display.)
radom_flash4sm

5.Drag the new created movie clip symbol to the stage (new created layer)

6. With the Movie Clip selected, go to properties –> put instance name as “container” and position whereever you want, in my case x:0 y:0
radom_flash6sm

Test it and you should be done :)