function getRandomUniqueSlide(arr) {
    if (document.forms[0].elements["MSOLayout_InDesignMode"].value == 0) {
        var str;
        var rndm = Math.floor(Math.random() * arr.length);
        str = arr[rndm];
        arr.splice(rndm, 1);
        return HTMLDecode(str);
    }
}

function HTMLDecode(s) {

    var decoded = $("<div/>").html(s).text();
    return decoded;
}