function cambiar(estilo) {
	if (estilo.visibility == hidden )
	{
		estilo.visibility = visible;
	}
	else
	{
		estilo.visibility = hidden;
	}
}

function cambiarDiv(id)
{
		document.getElementById(id).style.display='block';
}

function activarDiv(id, idBoton1, idBoton2)
{
		document.getElementById(id).style.display='block';
		document.getElementById(idBoton1).style.display='none';
		document.getElementById(idBoton2).style.display='block';
}

function ocultarDiv(id, idBoton1, idBoton2)
{
		document.getElementById(id).style.display='none';
		document.getElementById(idBoton1).style.display='none';
		document.getElementById(idBoton2).style.display='block';
}