[monolithed]

var shiffle = function (array, max) {
    var i = array.length;

    while(i--)
        array[i] == array[i-1] && array.splice(i, 1);

    return array.sort(function() {
        return .5 - Math.random();
    }).splice(0, max);
};

alert(shiffle([1, 1, 1, 2, 2, 4, 3, 3, 3, 5, 5, 5, 7, 8, 9], 5));