[Logician]

in forumdisplay.php, insert

PHP Code:

if ($forumid==19)
{
 eval("\$mycustombanner .= \"".gettemplate('mycustombanner19')."\";");
} 


before

PHP Code:

eval("dooutput(\"".gettemplate('forumdisplay')."\");"); 


Create a new Edit template named "mycustombanner19" and inside it put your banner and design it in HTML.

Then you can use variable $mycustombanner inside forumdisplay template whereever you like.