For SQL 2000

IF NOT EXISTS (SELECT 1 FROM master.dbo.sysservers srv WHERE srv.srvname = N'MyLinkedServer')

For SQL 2005

IF NOT EXISTS (SELECT 1 FROM sys.servers srv WHERE srv.server_id != 0 AND srv.name = N'MyLinkedServer')

>what I need is to know if a specific SQL Server is linked to another SQL Server, if not link whit sp_addlinkedserver...
>not to start-stop the SQL Server.
>For some stupid reasons they want to unconnect a linked server conection from a Web server and when some SQL stranasctions occurs re-establish the conection to send some info to the local network server, a after thar disconect the linked server again.
>