function cambiarMuestrario() { var $active = $('#muestrario DIV.activo'); if ( $active.length == 0 ) $active = $('#muestrario DIV:last'); var $next =  $active.next().length ? $active.next() : $('#muestrario DIV:first'); $active.addClass('ult-activo'); $next.css({opacity: 0.0}) .addClass('activo') .animate({opacity: 1.0}, 350, function() {$active.removeClass('activo ult-activo');}); } $(function() {setInterval("cambiarHeader()", 15000); setInterval("cambiarMuestrario()", 4000);});