function slideSwitch(campo) {

	var $active = $(campo + ' li.active');

	if ($active.length == 0) $active = $(campo + ' li:last');

	var $next =  $active.next().length ? $active.next() : $(campo + ' li:first');

	$active.addClass('last-active');

	$next.css({opacity: 0.0}).addClass('active').animate({opacity: 1.0}, 1000, function() { $active.removeClass('active last-active'); });

}