function getLayerObject(name)
{
 	if(document.layers)
 	{
 		return document.layers[name];
 	}
 	else
 	{
 		return document.getElementById(name).style;
 	}	
} 
 
function show()
{
	showLayer(this.layerName);
}

function hide()
{
	hideLayer(this.layerName);
}

function showLayer(layerName)
{
        myLayer = getLayerObject(layerName);
		myLayer.visibility="visible";
}
        
function hideLayer(layerName)
{
        myLayer = getLayerObject(layerName);
		myLayer.visibility="hidden";
}