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


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

	if(e.style.display == '')
		e.style.display = 'block';
	else
		if(e.style.display == 'none')
			e.style.display = 'block';
		else
			e.style.display = 'none';
}