check_foriegn_key TO FOREIGN KEY.

Dear Postgres Team,

I am still working away at fixing my database. I have decided to drop of
out of date check_foriegn_key function, and
move to the new FOREIGN KEY.

I am having a little trouble converting triggers to make use of the new
function, and wondered if someone could give me an example.

Taking the trigger;

CREATE TRIGGER check_user
BEFORE DELETE ON genUser
   FOR EACH ROW EXECUTE PROCEDURE
   check_foriegn_key(1,'cascade','userid','webuser','userid');

how would I correct it to make use of the new Foreign Key function?

I understand that this may be a simple question, but converting a non
backedup database when still learning Sql can be a scary thing!!!

Any help appreciated.

Best Regards,
Luke.