How To Drop Users Programmatically Through A Sp

Hi,

I want to drop users programmatically, is this possible? I tried

create PROCEDURE [dbo].[sp_DelAllUnusedLogins] AS
BEGIN
SET NOCOUNT ON;
DECLARE @UserName nvarchar(128)

DECLARE user_cursor CURSOR FOR
select name from sys.sysusers where status=12 and name
not in ('NT AUTHORITYSYSTEM','dbo')

OPEN user_cursor

FETCH NEXT FROM user_cursor INTO @UserName
WHILE @@FETCH_STATUS = 0
BEGIN

DROP USER @UserName
FETCH NEXT FROM user_cursor INTO @UserName

END

CLOSE user_cursor
DEALLOCATE user_cursor
END

But @UserName isn't accepted..