Update cursor - current of??

Hi All!

I had run into the following problem.
I created a function using cursors, but when I call it, it returns an
error....
I created a very simple "test" function - and the result is the same...
:-(((

The error message with the test function is the following:
------------------
ERROR: parser: parse error at or near "of" at character 49

WARNING: Error occurred while executing PL/pgSQL function proba
WARNING: line 10 at SQL statement
--------------------

Here is the source of my function:
--------------------
CREATE OR REPLACE FUNCTION "public"."proba" () RETURNS integer AS'
declare
n_id integer;
users_c cursor for select id from ugyfelek for update;

begin
open users_c;
loop
fetch users_c into n_id;
update users
set megj=''Something''
where current of users_c;
end loop;
close users_c;
return 1;
end;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;
----------------------

It seems to be a problem with the "current of" clause. The table "ugyfelek"
has primary key...

Could you help me to solve this problem?

Thanks: MaFa