Two-level navigation menu by catgories and their assigned articles
<txp:category_list parent="**SelectionInsertionPlaceholder**" exclude="**SelectionInsertionPlaceholder**" wraptag="ul" break="li" >
<txp:variable name="catclass" value="passive" />
<txp:if_category name='<txp:category />'>
<txp:variable name="catclass" value="active" />
</txp:if_category>
<txp:category title="1" link="1" class='<txp:variable name="catclass" />' />
<txp:article_custom category='<txp:category />' wraptag="ul" break="li" sort="title asc">
<txp:variable name="artclass" value="passive" />
<txp:if_article_id>
<txp:variable name="artclass" value="active" />
</txp:if_article_id>
<txp:permlink class='<txp:variable name="artclass" />'><txp:title /></txp:permlink>
</txp:article_custom>
</txp:category_list>
Added to Textpattern by Robert Wetzlmayr