Immagini a comparsa sulla destra delle sezioni!

.board .off:hover .aa, .board .on:hover .aa {opacity: .5}
.board .zz {background:url(http://i.imgur.com/EhQWa.png); background-size: 50px; background-position: 150% center; background-repeat:no-repeat; -webkit-transition: all 0.5s ease-in-out 0s;
-moz-transition: all 0.5s ease-in-out 0s;
-o-transition: all 0.5s ease-in-out 0s;
transition: all 0.5s ease-in-out 0s}
.board .off:hover .zz, .board .on:hover .zz {opacity: 1; background-position: 100% center}