Hi there,
I have a functioning OsC site with the Comodo certificate.
I'm not sure why you'd need a contrib to add the Comodo graphic to the site. As I recall, the code for the graphic with its javascript rollover came from Comodo when I purchased the SSL.
FWIW, the code I was sent looks like this:
<script language="JavaScript" src="
http://www.trustlogo.com/trustlogo/javascript/trustlogo.js" type="text/javascript">
</script>
<!--
TrustLogo Html Builder Code:
Shows the logo at URL http://www.gnpcrescendo.com/store/images/secure_site.gif
Logo type is Secure Site Seal - For SSL Certificate holders ("SC")
Not Floating
//-->
<script type="text/javascript">TrustLogo("http://www.gnpcrescendo.com/store/images/secure_site.gif", "SC", "none");</script>
Do you have a link to the contrib you're trying to use? I'll have a look at it.
I didn't put mine on the front page, but in the help pages, so I didn't add a new infobox.