Figured it out. Thanks to all.

Dim $Filter[0]
$Filter[0] = "user"
$ou.Filter = $Filter
for each $account in $ou
$name = $account.name
? "name = $name"
$groups = $account.groups
for each $group in $groups
$groupname = $group.name
?"groupname = $groupname"
IF $groupname = "TxSales"
?"YES"
ENDIF
next
next