AS3 array used to load and play random swfs?

Hi, I'm trying to use an array adapted from AS2 script to load random swfs called "koan_1.swf" or "koan_2.swf" etc into a "koan_loader_mc" on the stage. Each "koan_#.swf" has code in its last frame to both advance the "shuffle" array in the action script in the first frame of the stage and to load the next koan swf. The code below -- almost -- works, but....?
Frame on main stage:
// creates function called at the end of koan_#.swfs
function shuffle(a:Array) {
for (var ivar = a.length-1; ivar>=0; ivar--) {
var p = Math.floor(Math.random())(ivar+1);
var t = a[ivar];
a[ivar] = a[p];
a[p] = t;
// loads koans into koan_loader_mc
var index:uint = 0;
var koan_loader:Loader = new Loader();
var koan:Array =["swfs/koans/koan_1.swf","swfs/koans/koan_2.swf", "swfs/koans/koan_3.swf", "swfs/koans/koan_4.swf", "swfs/koans/koan_5.swf", "swfs/koans/koan_6.swf", "swfs/koans/koan_7.swf", "swfs/koans/koan_8.swf", "swfs/koans/koan_9.swf", "swfs/koans/koan_10.swf", "swfs/koans/koan_11.swf", "swfs/koans/koan_12.swf"];
koan.shuffle();
koan_loader.load(new URLRequest(koan[index]));
MovieClip(this).koan_loader_mc.addChild(koan_loader);
MovieClip(this).stop();
Code is on the last frame of the loaded koan swfs:
MovieClip(stage).index++
if(MovieClip(stage).index>MovieClip(stage).koan.length-1){
MovieClip(stage).index=0;
MovieClip(stage).koan.shuffle();
MovieClip(stage).koan_loader.load(new URLRequest(koan[MovieClip(stage).index]));
MovieClip(stage).koan_loader_mc.addChild(koan_loader);
Thanks for -- any -- guidance and suggestions...at my wit's end...

Thank you for taking the time to help, but......unfortunately it still isn't working. When the "koan.shuffle():" segment of code on the first frame of the stage timeline, below, is commented out, everything else in the movie (except randomizing of swfs) works fine.
This code loads swfs (but they are not randomized/shuffled):
// loads koans into koan_loader_mc
var index:uint = 0;
var koan_loader:Loader = new Loader();
var koan:Array =["swfs/koans/koan_1.swf","swfs/koans/koan_2.swf", "swfs/koans/koan_3.swf", "swfs/koans/koan_4.swf", "swfs/koans/koan_5.swf", "swfs/koans/koan_6.swf", "swfs/koans/koan_7.swf", "swfs/koans/koan_8.swf", "swfs/koans/koan_9.swf", "swfs/koans/koan_10.swf", "swfs/koans/koan_11.swf", "swfs/koans/koan_12.swf"];
//koan.shuffle();
koan_loader.load(new URLRequest(koan[index]));
MovieClip(this).koan_loader_mc.addChild(koan_loader);
Thanks again for your help....

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