pbootcms内页子栏目当前栏目如何实现高亮显示

{pboot:nav num=10 parent={sort:tcode}}{pboot:if('[nav:scode]'=='{sort:scode}')}<li><a class="biglink left_active" href="[nav:link]">[nav:name]</a></li>{else}<li><a class="biglink" href="[nav:link]">[nav:name]</a></li>{/pboot:if}{/pboot:nav}