Well since these are seperate sites, there should be several ways that you can accomplish this.

If you have your Sites set up in AD as seperate Sites you can say ...
 Code:
If INGROUP("HSTEACHERS") and @Site = "HighSchool"
 do Stuff
Else
 If INGROUP("HSTEACHERS") and @SITE = "MIDDLESCHOOL"
  Do this instead
 EndIf
EndIF


Or you can use the same type of logic with an IP Address

Or you can use a SELECT - CASE logic

 Code:
Select
  Case @Site = "HIGHSCHOOL"
    If INGROUP("HSTEACHERS")
     do stuff
    EndIf
  Case @Site = "MIDDLESCHOOL"
   If INGROUP("HSTEACHERS")
    do stuff
  Case 1
    ;No match so do nothing
EndSelect


And there are many other ways to accomplish it.
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