[iNils]

Можно еще так:
s = function (a, b) {
var r;
Math.floor (Math.random () * 2) == 0 ? r = 1 : r = -1;
return r;
};
///////////////////
arrayA = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
trace (arrayA);
arrayA.sort (s);
trace (arrayA);