Featured ads on showlistings template

If the goal is to simply show any "featured" ad listings under the category table when "browsing" by category, then your easiest and most straight forward method would be to use the listings smarty template. Take a look at the default home page to see how it is used to show the featured listings. Apply it to the browse.tpl in your custom template folder. If you want to style it more like the "showlistings", then use the code from the showlistings(2).tpl file the parts between the {foreach ...} ... {/foreach}. (change the "from=$results" to something else that you assign in your smarty call, see below).

Use the smarty {debug} on the browse page to see what the smarty variable is for the category that you are browsing and use that variable in your listings call. In the link that you gave above in your post the category is "1", so you are looking for the category variable that is one on that page.

So you will have something like this: (NOTE: the category=$cat <-- is the variable you need)

Code:

{listings limit="10" featured="Y" category=$cat assign="catfeatured"}
{foreach from=$catfeatured item="catfeat" name="catfeatured"}
... your display code for listings ...
{foreachelse}
{* leaving this blank to avoid errors *}
{/foreach}