var ver = parseInt(navigator.appVersion);
var layerName;


function showLayer(layerName)
{
	if (document.getElementById) 
		{ document.getElementById(layerName).style.visibility = "visible";}
	else if (document.all && ver == 4)
		{ document.all[layerName].style.visibility = "visible"; }
	else if (document.layers && ver == 4)
		{ document.layers[layerName].visibility = "show";}
	
}


function hideLayer(layerName)
{
	if (document.getElementById) 
		{ document.getElementById(layerName).style.visibility = "hidden";}
	else if (document.all && ver == 4)
		{ document.all[layerName].style.visibility = "hidden"; }
	else if (document.layers && ver == 4)
		{ document.layers[layerName].visibility = "hide";}
	
}