Using a "shuffle" function to randomize an array?

Hi, for some reason when the line of code "koan.shuffle();" is commented out swfs called "koan_1.swf" or "koan_2.swf" etc are loaded properly into a "koan_loader_mc" on the stage, albeit not randomized. (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.) Why does "koan.shuffle();" not only fail to randomize the array, but, break the entire loading process?
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;
This code loads swfs (but they are not randomized/shuffled):
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 (this is a clarified question from a previous post now marked as answered)

because shuffle() is a function, not an array method:
// 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;
This code loads swfs (but they are not randomized/shuffled):
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"];
shuffle(koan);
koan_loader.load(new URLRequest(koan[index]));
MovieClip(this).koan_loader_mc.addChild(koan_loader);
Thanks (this is a clarified question from a previous post now marked as answered)

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