How do I acess tables in SQL 2005 EXPRESS linked with SQL 2000 ?

what do you mean can't access?
what are you trying to do?
did you try to select from them? what message did you receive?

I can't access the contents of the tables.I am trying to insert values into the linked table from insert trigger on a table in sql 2000.But I am getting the following error:
System.Data.SqlClient.SqlException: Invalid object name 'linkedservername'.'tablename'.
Waiting for your reply.Thank you very much.

can you post here the insert statement?

I tried to insert values into a table in linked server after insert the values in a table in sql 2000 by using triggers.

CREATE TRIGGER trig_name ON [dbo].[tablename]
AFTER  INSERT
AS
BEGIN
DECLARE @staff_id VARCHAR(100)
DECLARE @weeknumber (100)
DECLARE @staff_id VARCHAR(100)
SELECT @staff_id= (SELECT staff_id FROM  Inserted)
SELECT @weeknumber = (SELECT weeknumber FROM  Inserted)
INSERT INTO  [TEST].[tbl_testexpense](staff_id,week_number) VALUES('@staff_id','@weeknumbe'r)
END

when using a linked server you have to specify the full table name:

linked_server_name.database_name.schema.table_name

I specified the full table name  and execute ,Then i get the following error.
Access to the remote server is denied because no login-mapping exists.

SQL EXPRESS 2005 will not allow the creation of the same username and password as in SQL 2000.