<div class="customNavigation">
    <a class="btn prev">&nbsp;</a>
    <a class="btn next">&nbsp;</a>
</div>

display: none;

http://5ape.ru/themes/PRS030068/js/megnor/custom.js

function productCarouselAutoSet() {
    $(".products_block .product-carousel").each(function() {
        var objectID = $(this).attr('id');
        if(widthClassOptions[objectID.replace('-carousel','')])
            var myDefClass= widthClassOptions[objectID.replace('-carousel','')];
        else
            var myDefClass= 'grid_default_width';
        var slider = $(".products_block #" + objectID);
        slider.sliderCarousel({
            defWidthClss : myDefClass,
            subElement   : '.slider-item',
            subClass     : 'product-block',
            firstClass   : 'first_item_tm',
            lastClass    : 'last_item_tm',
            slideSpeed : 200,
            paginationSpeed : 800,
            autoPlay : false,
            stopOnHover : false,
            goToFirst : true,
            goToFirstSpeed : 5000,
            goToFirstNav : true,
            pagination : true,
            paginationNumbers: false,
            responsive: true,
            responsiveRefreshRate : 200,
            baseClass : "slider-carousel",
            theme : "slider-theme",
            autoHeight : true
        });
        
        var nextButton = $(this).parent().find('.next');
        var prevButton = $(this).parent().find('.prev');
        nextButton.click(function(){
            slider.trigger('slider.next');
        })
        prevButton.click(function(){
            slider.trigger('slider.prev');
        })
    });
}
$(window).load(function(){productCarouselAutoSet();});

product-carousel

product-carousel

.products_block li {
    float: left;
    width: 33.333%;
}