function getLayer(layerName)
{

 return (document.all) ? document.all[layerName].style :
        (document.layers) ? document.layers[layerName] :
        document.getElementById(layerName);
}
function toggleLayer(layerName)
{

 with (getLayer(layerName)){
 	if (document.all)
	  display = (display == "none") ? "block" : "none";
	else
	  style.display = (style.display == "none") ? "block" : "none";
  }
}
function show(layerName)
{
	$(layerName).setStyle('display','block');
}
function hide(layerName)
{
	$(layerName).setStyle('display','none');

}