Javascript: incomplete parameters

Though I've fixed the 'visible'-typo above, javascript still does not work, since there is no value for 'visible':

$('.jcarousellite-4-1 .item-list').jCarouselLite({
btnNext: '.jcarousellite-next-4-1',
btnPrev: '.jcarousellite-prev-4-1',
mouseWheel: true,
visible:
});