Where is the problem?

CREATE FUNCTION CHANGE_PASSWORD (text, text) RETURNS bool AS '
BEGIN
ALTER USER $1 WITH PASSWORD ''$2'';
RETURN ''t'';
END;
' LANGUAGE 'plpgsql';

select CHANGE_PASSWORD('USER','PASS');

this get me "ERROR: parser: parse error at or near "$1"

could I make a function that not returns values?

cray2(at)mail(dot)com

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