function autostartcarousel_initCallback(carousel){

    carousel.stopAuto();

    carousel.container.parent().mouseenter(function(){
      carousel.startAuto(1);
    });

    carousel.container.parent().mouseleave(function(){
      carousel.stopAuto();
    });
  }

jQuery(document).ready(function(){
  jQuery('#clientsCarousel').jcarousel({
    auto: 0,
    visible: 8,
    scroll: 1,
    wrap: 'circular',
    initCallback: autostartcarousel_initCallback
  });

  jQuery('#sertificateCarousel').jcarousel({
    auto: 0,
    visible: 6,
    scroll: 1,
    wrap: 'circular',
    initCallback: autostartcarousel_initCallback
  });

});