<script type="text/javascript">
// <![CDATA[
Array.prototype.random = function(limit)
{
    if (typeof limit == 'undefined' || limit < 0) limit = 1;
    else if (!limit) limit = this.length;
    for (var i = 0, source = this, target = new Array(), n = source.length; i < limit && n > 0; i++)
    {
        do { var index = Math.random(); } while (index == 1);
        index = Math.floor(index * n);
        target.push(source[index]);
        source[index] = source[--n];
    }
    return target;
}

document.write(new Array(
// Tu wpisz kolejne elementy:

'Tekst 1',
'Tekst 2',
'Tekst 3'

).random(3).join(''));

// ]]>
</script>