Which template shows the first post of a thread?

[bigtime]

Hi,

I wish to put some special code before and after the subject and first thread in each post. Which part of which template would I put this?

Specifically this

<!-- google_ad_section_start -->

Forum Subject and post....

<!-- google_ad_section_end -->

http://www.google.com/support/adsens...topic=0&type=f


Thanks,

Tim