plpgsql function gets wierd with Null parameters

When I call the following plpgsql function with the last two parameters
as Null, the first parameter loses it's value:
ma=> select createFund('fred', null, null);
createfund
------------

(1 row)

However it works fine when I give values to the last two params:
ma=> select createFund('fred', 'joe', 5);
createfund
------------
fred
(1 row)

Here's the function (I've hacked it so that it just returns the first
parameter):
create function createFund(varchar, varchar, int) returns text as '
DECLARE
fundname ALIAS FOR $1;
fundsymbol ALIAS FOR $2;
fundcusip ALIAS FOR $3;
existing varchar(100);
fundid int;
rec RECORD;
retval text;
datecount smallint;
BEGIN
RETURN fundname;
...
END;
' language 'plpgsql';

Any ideas?

-Skeets Norquist
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