display adds in a forum post ?

[es-league.com]

I have some Tradedoubler affiliates set up
and it gives me the option to copy and paste
codes into my site either using html,javascript or iframe.

I can add banners using a hack I found here but is it
possible to add advertising directly into a forum post ?

an example of what I would like to use :

<script type="text/javascript">
var uri = 'http://impgb.tradedoubler.com/imp?type(js)g(996088)a(1298210)' + new String (Math.random()).substring (2, 11);
document.write('<sc'+'ript type="text/javascript" src="'+uri+'" charset="ISO-8859-1"></sc'+'ript>');
</script>

Is this possible ? I was looking through the mods and hacks
but not sure what to use.
Any help would be appreciated please...