function hideLayer(layerName)
        {
            if (document.getElementById) 
            {
                var targetElement = document.getElementById(layerName);
                targetElement.style.visibility = 'hidden';
            }
        }
    	
        function showLayer(layerName)
        {
            if (document.getElementById) // Netscape 6 and IE 5+
            {
                var targetElement = document.getElementById(layerName);
                targetElement.style.visibility = 'visible';
            }
        }
		
		function togleLayer(layerName1,layerName2)
        {
            if (document.getElementById) // Netscape 6 and IE 5+
            {
                var targetElement = document.getElementById(layerName1);
                targetElement.style.visibility = 'hidden';
                var targetElement = document.getElementById(layerName2);
                targetElement.style.visibility = 'visible';
            }
        }