The slider only shows you have 6, literally;
<ul id="slide_navigation" style="position: absolute; width: 1560px; height: 80px;">
<li class=""><a href="#"><img src="https://www.tgear.funsite.cz/wp-content/uploads/2012/11/A7jKIB_CQAAny6_-100x75.jpg" alt="Kluci v USA"></a></li>
<li class=""><a href="#"><img src="https://www.tgear.funsite.cz/wp-content/uploads/2012/11/1960-11-100x75.jpg" alt="Veterán s motorem ze stíha?ky Spitfire je na prodej!"></a></li>
<li class=""><a href="#"><img src="https://www.tgear.funsite.cz/wp-content/uploads/2012/10/Large-Image1-100x75.jpg" alt="Bond Speciál Online"></a></li>
<li class="activeSlide"><a href="#"><img src="https://www.tgear.funsite.cz/wp-content/uploads/2012/10/image-big-100x75.jpg" alt="Online série"></a></li>
<li><a href="#"><img src="https://www.tgear.funsite.cz/wp-content/uploads/2012/10/bugatti-veyron_super_sport_2011_1600x1200_wallpaper_11-100x75.jpg" alt="Bugatti jde do protiútoku"></a></li>
<li><a href="#"><img src="https://www.tgear.funsite.cz/wp-content/uploads/2012/10/screen-shot-2012-10-25-at-10-37-100x75.jpg" alt="Top Gear: The worst car"></a></li>
</ul>
When you press the arrows, this message appears in the browser’s console log;
carouFredSel: Not enough items: not scrolling jquery.carouFredSel-2.3.1.js:587