Stored Procedures with parameters

Hi,
I am trying to pass a parameter, selected from a drop down html list/form to a stored procedure on a different asp page. Can anybody tell me how to put a result like that into my SQL stored procedure? So far I only need an example that takes one parameter (server name). I have no idea how to do this so any advice needs to be "dumbed down" so I understand it all Thanks
Cam

Here's a sample stored procedure that accepts a parameter.

CREATE PROCEDURE spSomeName
(
@servername varchar(20)
)
AS
SET NOCOUNT ON

SELECT * FROM Table1
WHERE ServerName = @servername

SET NOCOUNT OFF
GO

Thank you very much.
Cam