on *:text:!cw off*:#: { 
  If ($nick isop $chan) { 
    unset %cwonoff. [ $+ [ $chan ] ] 
    msg $chan CastleWars World script off in # 
  } 
} 
on *:text:!cw on*:#: { 
  If ($nick isop $chan) { 
    set %cwonoff. [ $+ [ $chan ] ] on 
    msg $chan  CastleWars World script on in # 
  } 
}  
-----------------------------------
Put this under the on *:text: thing, before or after if's doesn't matter :p

  if (%cwonoff. [ $+ [ $chan ] ] == on) {