smolnikov

function declOfNum(number, titles) {
    "use strict";

    var cases = [2, 0, 1, 1, 1, 2];
    return titles[(number % 100 > 4 && number % 100 < 20) ? 2 : cases[(number % 10 < 5) ? number % 10 : 5]];
}

use:
declOfNum(count, ['найдена', 'найдено', 'найдены']);