Trying To Get The Value From A Select Prior To An Insert

I'm trying to find out if a certain row exists in my table, if it does exist then I do nothing if it doesn't exist I will insert a value. Only problem is i'm quite new and not sure how to get the values from the insert to correctly check if they already exist. Heres my attempt using query analyser





DECLARE @FK_UserID int, @NoteID int, @BeenRead NVARCHAR(10), @TMPuserID INT, @TMPnoteID INT





SET @FK_UserID = 1


SET @NoteID = 254


SET @BeenRead = 'MyTestHere'











SELECT DISTINCT Backup_UserNotes.BackUp_UserID, Backup_UserNotes.BackUp_NoteID


FROM User_Notes INNER JOIN


Note ON User_Notes.FK_UN_NoteID = Note.NoteID INNER JOIN


Backup_UserNotes ON Note.NoteID = Backup_UserNotes.BackUp_NoteID





WHERE BackUp_UserID = @FK_UserID AND BackUp_NoteID = @NoteID








SELECT @NoteID = @@IDENTITY


SELECT @FK_UserID = @@IDENTITY





IF @FK_UserID = NULL AND @NoteID = NULL





BEGIN


INSERT BackUp_UserNotes (


BackUp_NoteID,


BackUp_UserID,


BackUp_Read)





SELECT @NoteID, @FK_UserID, @BeenRead








END





-- RETURN 0


------------------------------------------------


GO





Anybody know the best solution? Thanks