var changing_thumbs = new Array();
function changeThumb(index, i, num_thumbs, path)
{
    if (changing_thumbs[index])
    {
        hidden_image_id = (i + 1) % num_thumbs;
        
        $(index).src = path + "/thumb" + i + ".jpg";
        $("hidden_image").src = path + "/thumb" + hidden_image_id + ".jpg";
        
        i = i % num_thumbs;
        i++;
        setTimeout("changeThumb('" + index + "'," + i + ", " + num_thumbs + ", '" + path + "')", 600);
    }
}    
function startThumbChange(index, num_thumbs, path)
{    
    changing_thumbs[index] = true;
    
    changeThumb(index, 1, num_thumbs, path);
}
function endThumbChange(index, path)
{
    changing_thumbs[index] = false;
    document.getElementById(index).src = path + "/thumb.jpg";
}