function showLayer(layerName, shadowLayerName)
        {
            if (document.getElementById) // Netscape 6 and IE 5+
            {
                var targetElement = document.getElementById(layerName);
                var shadowElement = document.getElementById(shadowLayerName);
                targetElement.style.top = shadowElement.style.top;
                targetElement.style.display = 'block';
            }
        }


        function hideLayer(layerName)
        {
            if (document.getElementById) 
            {
                var targetElement = document.getElementById(layerName);
                targetElement.style.display = 'none';
            }
        }