There is a UDF here that might help: UserGroups() - returns all groups of a given user

And here is kind of a skeleton of what you might do to get started(untested)

Code:
 

$yourdomain="Test"

$findstr="LOC"

$groups=usergroups($yourdomain,@userid)

$counter=0

while $counter<=ubound($groups) and $found<>1

  if instr($groups[$counter],$findstr)>0

    $found=1

    

;      your

;

;      code

;

;      here

;



  endif  

  $counter=$counter + 1 

loop