Function won't compile

Hi,

Does anybody know why the function insert_case() won't compile. When I
INSERT a new record I always get the following error message :

NOTICE:  plpgsql: ERROR during compile of insert_case near line 1
"RROR:  parse error at or near "

Below is the function and trigger. ('Now' is surrounded with single quotes)

CREATE FUNCTION insert_case () RETURNS INTEGER AS '
  BEGIN
    NEW.date_created := ''now'';
  END;
' LANGUAGE 'SQL';

CREATE TRIGGER trg_insert_case BEFORE INSERT ON pfdcase FOR EACH ROW EXECUTE
PROCEDURE insert_case();


Thanks