[Zachariah]

This hack can work where ForumID can be used. The FORUMHOME does not have in "ID". There is a way that you can set a default banner that does not change via AdminCP. I have worked the banner in the $header to construct a default banner if there is not one filled in. This wil also show the default image in the FORUMHOME (in red, below).

<if condition="$foruminfo['banner'] AND $foruminfo['bannerlink']"><center><a href="$foruminfo[bannerlink]" target="_blank"><img src="$foruminfo[banner]" alt="$foruminfo[banneralt]" border="0" /></a></center><br />
<else />
<if condition="$foruminfo['banner']"><center><img src="$foruminfo[banner]" alt="$foruminfo[banneralt]" border="0" /></center><br />
<else />
<if condition="$foruminfo['bannercode']"><center>$foruminfo[bannercode]</center><br />
<else />
<a href="http://www.yoursite.com"><img src="images/banner/default.gif" border="0" alt="banner image" /></a>
</if>
</if>
</if>

You could also just edit the FORUMHOME:
after $navbar

<a href="http://www.yoursite.com"><img src="images/banner/default.gif" border="0" alt="banner image" /></a>

Fill in your info. (this will be static, but will work)