browser = navigator.appName;
browserNum = parseInt(navigator.appVersion);

if (browser == "Netscape")
	{
		layerRef = "document.getElementById('";
		endLayerRef = "')";
		styleRef = ".style";
	}
else 	{
		layerRef = "document.all['";
		endLayerRef = "']";
		styleRef = ".style";
	}

var currentLayer = "";

function set_currentLay(layer)
{
	currentLayer = layer;
}

function showLayer(layer)
{
	if (currentLayer != "") eval(layerRef+currentLayer+endLayerRef+styleRef+".visibility = 'hidden'"); 
	eval(layerRef+layer+endLayerRef+styleRef+".visibility = 'visible'"); 
	currentLayer = layer;	
}

function showOnlyLayer(layer,visibility)
{	
	eval(layerRef+layer+endLayerRef+styleRef+".visibility = visibility"); 	
}

function hiddenLayer(layer)
{	
	eval(layerRef+layer+endLayerRef+styleRef+".visibility = 'hidden'"); 	
}