<div class="forumcontainer">
<div class="forumsright">
xen: if nodeid is category 4,5,6 ? show /xen:if
</div><!-- end forumsright -->
<div class="forumsleft">
xen: if nodeid is category 1,2,3 ? show /xen:if
</div><!-- end forumsleft -->
</div><!-- end forumcontainer -->