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'); });
}