Custom Error Pages 2
 

In the past, I've been told that custom error messages (a unique message depending on the error) weren't possible with the way the phrases work. But I was thinking that maybe, it could be possible using an <if> condition. Would it be possible for a specific message to appear based on the last page you visited?

For example, two of our forums are permission based. A writer's section and a trade forum. I'm making it so that you have to join a particular public User Group to start threads in those respective sections. Now, say a new user tries to start a trade thread, only to receive the the No Permission page, but the page displays a custom message explaining why he can't access it and what he needs to do. Another user tries the same thing over at the writers section, only to receive a different message.

Is there any way to finagle an <if> condition to display those messages based on the last link clicked or the last page location?