FirstWeekOfYear as parameter of DatePart

Haw to make FirstWeekOfDay parameter work in SQL Server 2000.
In Access 2000 datepart function has 3 parameters.
Why it is't in SQL Server 2000.
Help pleaseStraight from Books Online:

SET DATEFIRST
Sets the first day of the week to a number from 1 through 7.

Syntax
SET DATEFIRST { number | @.number_var }

Arguments
number | @.number_var

Is an integer indicating the first day of the week, and can be one of these values.

Value First day of the week is
1 Monday
2 Tuesday
3 Wednesday
4 Thursday
5 Friday
6 Saturday
7 (default, U.S. English) Sunday

Remarks
Use the @.@.DATEFIRST function to check the current setting of SET DATEFIRST.

The setting of SET DATEFIRST is set at execute or run time and not at parse time.

Permissions
SET DATEFIRST permissions default to all users.

Examples
This example displays the day of the week for a date value and shows the effects of changing the DATEFIRST setting.

-- SET DATEFIRST to U.S. English default value of 7.
SET DATEFIRST 7
GO
SELECT CAST('1/1/99' AS datetime), DATEPART(dw, '1/1/99')
-- January 1, 1999 is a Friday. Because the U.S. English default
-- specifies Sunday as the first day of the week, DATEPART of 1/1/99
-- (Friday) yields a value of 6, because Friday is the sixth day of the
-- week when starting with Sunday as day 1.
SET DATEFIRST 3
-- Because Wednesday is now considered the first day of the week,
-- DATEPART should now show that 1/1/99 (a Friday) is the third day of the -- week. The following DATEPART function should return a value of 3.
SELECT CAST('1/1/99' AS datetime), DATEPART(dw, '1/1/99')
GO