Conditional stored procedure question

I need to create a stored proc which has a conditional WHERE clause depending on the value of a passed parameter. I'm having trouble handling the condition. I'm missing something here.

CREATE PROCEDURE Milestone_Get
(@.myID int, @.iShowAll int)

AS

SELECT uid, name, date, registration_confirmed
FROM tbl_members

WHERE
If @.iShowAll = 0
begin
(uid = @.myID) AND (registration_complete = 0)
end
else
begin
(uid = @.myID)
end

GO

Thanks,
davidyou can use a CASE statement but i do not know the syntax..heres another way of doing it

CREATE PROCEDURE Milestone_Get
(@.myID int, @.iShowAll int)
AS
if @.iShowAll = 0
 SELECT uid, name, date, registration_confirmed FROM tbl_members where uid = @.myID AND registration_complete = 0
else
 SELECT uid, name, date, registration_confirmed FROM tbl_members where uid = @.myID
go

HTH|||Here's an example using a Case

SELECT uid, name, date, registration_confirmed FROM tbl_members
WHERE (uid = @.myID) AND registration_complete = CASE WHEN @.iShowAll = 0 THEN 0 ELSE registration_complete END