Problem with temporary table -- Urgent

Hi,
We are using postgresql 7.3.3, we are encountering the following problems when we used temporary tables.

Here with i'm sending my Sample function.

create or replace function TestTemp_refcur(refcursor) returns refcursor As '
declare
refc alias for $1;
lString Varchar(4000);
begin
lString := '' CREATE OR REPLACE FUNCTION TESTTEMP() RETURNS varchar as ''''

BEGIN '';
lString := lString || '' create temporary table temp_Table( Name Numeric);'';

lString := lString || '' insert into temp_Table values (1); '';

lString := lString || '' insert into temp_Table values (2);'';

lString := lString || '' return null; end;'''' language ''''plpgsql'''';'';

raise notice '' Notice is % '', lString;
execute lString;
open refc for select * from temp_Table;
return refc;
end;
' language 'plpgsql';

begin;
select TestTemp_refcur('funcursor');
fetch all in funcursor;
commit;

psql:test18.sql:25: WARNING: Error occurred while executing PL/pgSQL function t
esttemp_refcur
psql:test18.sql:25: WARNING: line 20 at open
psql:test18.sql:25: ERROR: Relation "temp_table" does not exist
psql:test18.sql:26: ERROR: current transaction is aborted, queries ignored unti
l end of transaction block

Kindly guide as to solve this problem....

Any help will be highly appreciated........

Thanks & Regards
Vijay