HTML+CSS+JavaScript

.sub:hover > ul.subcat {visibility: visible; display: block;}

Для HTML

<ul id="cat" class="sf-menu sf-js-enabled"> <li class="sub">     <a href="">Каталог</a>             <ul class="subcat">                                     <li class="">     <a href="">Lorem ipsum</a>     </li>                                                <li class="">     <a href="">Dolor sit amet </a>     </li>                                                <li class="">     <a href="">Conse ctetur </a>     </li>                                                <li class="sub last">     <a href="">Adipisicing </a>                  </li>                            </ul>     </li> </ul>

Выставил important и заработало