function toggle(layerID)
{
	if (document.layers)
	{
		current = (document.layers[layerID].display == 'none') ? 'block' : 'none';
		document.layers[layerID].display = current;
	}
	else if (document.all)
	{
		current = (document.all[layerID].style.display == 'none') ? 'block' : 'none';
		document.all[layerID].style.display = current;
	}
	else if (document.getElementById)
	{
		vista = (document.getElementById(layerID).style.display == 'none') ? 'block' : 'none';
		document.getElementById(layerID).style.display = vista;
	}
}