source: products/ploneorg.kudobounty/trunk/ploneorg/kudobounty/skins/ploneorg_kudobounty/ploneorg_bounty.js.dtml @ 3148

function getRandomSubset(array, choice_num) {
    // Return randomly selected *choice_num* elements from the array
    var tmp, current, top = array.length;
    if (array.length > choice_num) {
        // random elements places to the end of the array
        for(top=array.length-1; top>array.length-choice_num; --top) {
            current = Math.floor(Math.random() * top);
            tmp = array[current];
            array[current] = array[top];
            array[top] = tmp;
        }
        return array.slice(array.length-choice_num,array.length)
    } else {
        return array;
    }
};

$(document).ready(function() {
    $(getRandomSubset($("#portal-bounty-program ul li"), 5))
        .each(function(){
            $(this).removeClass('hidden');
        })
});