Cycle2's scrollVert transition plugin must be included in order to use the scrollVert effect. See the Download page for a link to download the scrollVert plugin.
The scrollVert effect is achieved by assignin the fx option to scrollVert.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> <script src="/jquery.cycle2.js"></script> <script src="/jquery.cycle2.scrollVert.js"></script> ... <div class="cycle-slideshow" data-cycle-fx="scrollVert" > <img src="/images/p1.jpg"> <img src="/images/p2.jpg"> <img src="/images/p3.jpg"> <img src="/images/p4.jpg"> </div>