function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function cambiaCandado()
{
  if (readCookie("usrcpx") == null)
    window.parent.menusuperior.document.getElementById('candado').src='imagenes/icono_candado_abierto.gif'
  else
    window.parent.menusuperior.document.getElementById('candado').src='imagenes/icono_candado_cerrado.gif';
}