templates/extcal_categorie.tpl
<table>
<tr>
<th>
<{foreach item=cat from=$cats}>
<div style="float:left; margin-left:5px;">
<div style="float:left; background-color:#<{$cat.cat_color}>; border:1px solid #ffffff; margin-right:5px;">
</div>
<{$cat.cat_name}>
</div>
<{/foreach}>
</th>
</tr>
</table>