small hack, need help

[brandy]

My moderators answer questions in our forums, they are supposed to respond to each thread. It would be nice to be able to have an icon next to thread title to show if it has already been answered by a moderator or not. It will save my moderator's time, so they don't have to click on each thread to see if all the posts were by other members without a moderator responding yet.

Could someone put together the code for me? And I'm not sure what template to put it in? Is it showthread_list? Or showthread? Or displayforum?

I don't know how to write a code that will look through a thread to see if a certain usergroup has posted in that thread?

Thanks much!
Brandy