Hi @johnrhopkins,
You may use either of these memberium api calls:
memb_hasMembership( $level )
Returns true if the current visitor is logged in, and has the specified membership. Returns false if the user is not logged in, or is logged in and does not have the membership specified. The function takes the name of the membership as the parameter, and is not case-sensitive.
memb_hasMembershipLevel( $level )
Returns true if the current visitor is logged in, and has a membership with the specified membership level number or higher. Returns false if the user is not logged in, or is logged in with a membership level lower than the number level specified. This function takes a number parameter.
Please look here for additional memberium functions you may wish to use!