Does this If statement make sense?

I'm again working with someone else's code and I have a problem I believe is in the section below. The problem is, I can't seem to understand what the "IF" conditions are saying here. The problem I have is with the second condition. To me this reads in psudo code: If( X and (if Y exists, then W otherwise Z)) Does this work? If so how is it evaluated? Here is the actual code. <code> if ($tostaf && ($reply->comment ? $config->send_comment_staf : $config->send_emailreply_staf)) { $to=array(); $vars["ticketurl"]=$config->webpath."ticket.php?id=".$ticket->id; if ($reply->comment) { $condition=" AND followups.employee<>'$reply->employee'"; } </code> Thanks, Jeff