Just add it below the navbar in the FORUMDISPLAY template. You actually have to use foruminfo, instead of forum:
HTML Code:
<vb:if condition="in_array($foruminfo['forumid'], array(1,2,3,4,5))">
<div align="center"><img src="images/catalogs/{vb:raw foruminfo.forumid}.png" align="center" alt="IOGAMES" border="0" width="800" height="150" /></div>
</vb:if>
And it isn't community indifference, it was lack of details given. Instead of talking about what used to be the code, it would have helped to just say what you wanted - give us an image of what you want.