aquarius : Link to sibling (prev or next node)

<div class="controller">
    {assign var=previous_sibling value=$node|previous_sibling}
    {assign var=next_sibling value=$node|next_sibling}
    {link node=$previous_sibling class="skipPrev"}{wording prev}{/link}
    {if $previous_sibling && $next_sibling}<div class="sep">|</div>{/if}
    {link node=$next_sibling class="skipNext"}{wording next}{/link}
</div>