<vb:if condition="$show['breadcrumb']">
<li class="navbit"><a href="{vb:raw nav_url}"><font color="white">{vb:raw nav_title}</font></a></li>
<vb:else />
<li class="navbit lastnavbit"><span><font color="white">{vb:raw nav_title}</font></span></li>
</vb:if>

Bu şekilde dener misiniz.