function changeOpacity(thisObj)
    {
//        var numberOfPictures = 9;
        var numberOfPictures = 12;
        for (var i = 1; i <= numberOfPictures; i++) {
            if (document.getElementById('status'+i) != null) {
                if (document.getElementById('status'+i).id == thisObj.id && document.getElementById('status'+i).value == 0) {
                    new Effect.Opacity('el'+i, {duration:0.5, from:1.0, to:0.4});
                    document.getElementById('status'+i).value = 1;
                } else if (document.getElementById('status'+i).id != thisObj.id && document.getElementById('status'+i).value == 1) {
                    new Effect.Opacity('el'+i, {duration:0.5, from:0.4, to:1.0});
                    document.getElementById('status'+i).value = 0;
                }
            }
        }
}