Фильтрация тем по префиксам

<div style="margin-bottom:10px">
<xf:if is="{$forum.node_id} == 68">
<span class="">Filter by Prefix:</span>
<a href="INSERT FORUM URL HERE">
<span class="label label--red">All</span></a>
    CODE FOR STEP B WILL BE INSERTED HERE
        </xf:if>
</div>

<a class="labelLink" href="?prefix_id=1">
<span class="label label--red">Name of Prefix 1</span></a>
    <a class="labelLink" href="?prefix_id=2">
<span class="label label--red">Name of Prefix...