My issue is the same as this thread http://ellislab.com/forums/viewthread/164457/ I wish to place two category menus on the same page and am getting validation errors due to the fact that the id nav_categories is being generated twice by EE2.x. Not sure how this guy got around the problem any help welcomed.
{exp:channel:categories channel="offices" class="subnav" [color=red]id="dummy1"[/color] }
<a href="http://{path=%27portal/offices%27}">{category_name}</a>
{/exp:channel:categories}
<div class="section_name">
<center>
<h2>Sales Offices</h2>
<p> </center><br />
</div><br />
{exp:channel:categories channel="offices" class="subnav" id="dummy2" } <a href="http://{path=%27portal/offices%27}">{category_name}</a> {/exp:channel:categories}