function layerOpen(layeron, layeroff)
{
    layerson = layeron.split(',');
    for(var i=0; i<layerson.length; i++)
    {
        document.getElementById(layerson[i]).style.display = "block";
        if(layeroff != '')
        {
            layersoff = layeroff.split(',');
            for(var ioff=0; ioff<layersoff.length; ioff++)
            {
                if(layersoff[ioff] != layerson[i] && document.getElementById(layersoff[ioff]))
                {
                    document.getElementById(layersoff[ioff]).style.display = "none";
                }
            }
        }
    }
}