How can i attach a SQLServer2005 db to an instance of SQLServer 2000?

i have a db that created in sql2000 and then iattached it to sqlserver 2005 ,now i want to attach this db to sql server 2000 again,but when i do that i get an error message and the attach process fails.plz help me and show me a way to attach this db.

Short answer: you can't :-(
Once you have attached it to SQL Server 2005 it is no longer compatible with the SQL Server 2000 file format.