Insert Value Not Happy, Why?

How am I doing so far? I am trying to Insert the user_id if it does not allready exist in the table. But it does not like the value I am giving it in the INSERT statement.

What can I do?

 ALTER PROCEDURE dbo.ap_Update_Usr_Type_Data

-- define parameters
--@passUserId int

AS

--Set @passUserId = UserId

SELECT [user_id] As UserId
FROM CC_host.dbo.usr_table As t1
Where(email LIKE N'%@%' And email LIKE N'%usa.com') Order By UserId

If Not Exists (Select [user_id] As UserId2 From Usr_Type_Data WHERE UserId2 = UserId)

INSERT INTO Usr_Type_Data (user_id, CustomerTypeId) VALUES(t1.UserId, 7)

GO

 The error I am getting in Query Analyzer (SQL SERVER 2000) is:

The name 'UserId' is not permitted in this context. Only constants, expressions, or variables allowed here. Column names are not permitted.