Fisher Yates shuffle algorithm in JavaScript, taken from Pratik Deoghare on Stack Overflow. More info on the concept: http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle

gistfile1.txt

function fisherYates(myArray,nb_picks){
    for (i = myArray.length-1; i > 1  ; i--){
        var r = Math.floor(Math.random()*i);
        var t = myArray[i];
        myArray[i] = myArray[r];
        myArray[r] = t;
    }
    return myArray.slice(0,nb_picks);
}