Jcarousel captions strange behavior

[bondweb]

Hi there I add

    $('.jcarousel').on('jcarousel:visiblein', 'li', function(event, carousel) {
var caption = $(this).find("img").prop("alt");
$('.jcarousel-caption').text(caption);

in the jcarousel.basic.js to show alt text like an image caption

I also add

in the carousel html file

<h3 class="jcarousel-caption"></h3>

It's working, but jcarosel doesn't shows the first image caption after the page loading.

jcarousel shows the first image caption only after click the jcarousel-control-prev and jcarousel-control-next

There's anyone can help me to understand why?

Thanks in advance