fadeOpacity.addRule('oR1', .3, 1, 60);

function showPlay(string)
{
    var button = document.getElementById(string);
    button.style.visibility = 'visible';
    fadeOpacity(string, 'oR1');
}

function hidePlay(string)
{
    fadeOpacity.back(string);
    var button = document.getElementById(string);
    button.style.visibility = 'hidden';
}

function showThumbs()
{
    var thumbsIds = new Array("square2", "square4", "square5", "square6", "square7", "square9", "square11", "square12");

    for (i = 0; i < thumbsIds.length; ++i)
    {
        var div = document.getElementById(thumbsIds[i]);
        div.style.visibility = 'visible';
        fadeOpacity(thumbsIds[i], 'oR1');
    }
}