[Simon Lloyd]

You would then need to edit the forumbit templates, search for "Description" and you'll see something like

<if condition="$show['forumdescription']">
<div class="smallfont">$forum[description]</div>
</if>

and you want to surrond that with your condition like

<if condition="THIS_SCRIPT != 'showthread' AND $show['forumdescription']">
<div class="smallfont">$forum[description] <img src="/images/misc/MYADBANNER.gif" /></div>
</if>
<else />
<if condition="$show['forumdescription']"><div class="smallfont">$forum[description]</div>
</if>
</if>

Or something like that. you can use html in the description as i just added a picture to one of mine, when i have time i'll see what else we can use for a condition