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
ALIASFOR $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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