http://stackoverflow.com/a/6274381 modified from: http://jsfromhell.com/array/shuffle

shuffle.js

/**
 * Shuffles array in place.
 * @param {Array} a items The array containing the items.
 */
function shuffle(a) {
    var j, x, i;
    for (i = a.length; i; i--) {
        j = Math.floor(Math.random() * i);
        x = a[i - 1];
        a[i - 1] = a[j];
        a[j] = x;
    }
}

var myArray = ['1','2','3','4','5','6','7','8','9'];
shuffle(myArray);