I made a similar snippet a while ago...without the use of /scon and with the window that IllogicTC mentioned above. Odd :S

#Spy on
on *:TEXT:*:#: { 
  window -d @ServerSpy 0 0 900 300 tahoma 12 | aline @ServerSpy $bookend $server 6-  $+ $chan $bookend $quote.begin $timestamp $quote.end  $bookend $nick 6-  $+ $1-
}
#Spy end

Below is an edited version not including my custom aliases

#Spy on
on *:TEXT:*:#: { 
  window -d @ServerSpy 0 0 900 300 tahoma 12 | aline @ServerSpy $server 6-  $+ $chan  $timestamp $nick 6-  $+ $1-
}
#Spy end