help with function .. .. date data type

I have a table with 7 columns and Im trying to pull a section(rows) of the
table

by using the date column(field), in a function. I want it to work like so;

# Select Slice('03/01/2004', '03/05/2003');

But Im getting an error .. .. ...

------------------------- this is the error ------------------------------

NOTICE: Error occurred while executing PL/pgSQL function slice

NOTICE: line 9 at SQL statement

ERROR: zero-length delimited identifier

-------------------------- end of error -----------------------------------

What Am I doing wrong.

------------------------------ my code ----------------------------------

CREATE FUNCTION Slice(date, date)

RETURNS date AS'

DECLARE

f_table RECORD;

lower Alias for $1;

upper Alias for $2;

BEGIN

set datestyle to ""US, SQL"";

for name in lower..upper

Loop

SELECT * INTO f_table from g_table -- my g_table is the real table
in the datebase.

WHERE g_table.date BETWEEN upper AND lower

ORDER BY g_table.date;

End Loop;

END;

'Language 'plpgsql';

Ed..