Left/right side of a message?

[BSD2000]

I'm trying to setup a skyscraper ad on the right hand of the forum, but only display once you read a post in a board, not when your viewing the board list or list of messages in a board. So, instead of a 'left side of forum', I'm looking for a 'left side of a message' option. Is that possible? If I select a board, shouldn't it only appear when the user enters that board and not when your viewing the list of boards?

Previously, I was using the free SMFADS v2.3 mod which worked the way I expected it. Is there a way to implement the same capability with Ad Seller Pro?

[SMFHacks]

Currently there is no option just to show the left side in a boards only. There is an option to choose which boards to have it appear in or none.
But not just inside boards.

It could be done with some custom code tweaks to the index.template.php file to only show if inside a board.