function with tablename parameter

hello,

it is possible to write something similar???

create function get_count(varchar(32)) RETURNS int4 AS '
DECLARE
tmp int4;
BEGIN
SELECT COUNT(*) INTO tmp FROM $1;
RETURN tmp;
END;' LANGUAGE 'plpgsql';

SELECT get_count('k_part');
SQL error:
ERROR: parser: parse error at or near "$1" at character 24

thanx, miso