Stored Procedure - Conditional Expressions

I want to return a subset of data from my 'items' table using a stored procedure based on a number of parameters as follows :

customer code varchar(8)
userid varchar(10)
status tinyint

where the customer code can be any valid customer code OR blank, the userid can be any valid userid or blank and the status can be 1 (item is open), 2 (item is closed) or 3 (item is open or closed, i.e. no filter on status)

Is there a better way to achieve this than the following disaster:


IF LEN(RTRIM(LTRIM(@custcode))) = 0
BEGIN
IF LEN(RTRIM(LTRIM(@userid))) = 0
BEGIN
IF @status = 1
BEGIN
-- SELECT Query here !!
END
ELSE
BEGIN
IF @status = 2
BEGIN
-- SELECT Query here !!
END
ELSE
BEGIN
-- SELECT Query here !!
END
END
ELSE
BEGIN
IF @status = 1
BEGIN
-- SELECT Query here !!
END
ELSE
IF @status = 2
BEGIN
-- SELECT Query here !!
END
ELSE
BEGIN
-- SELECT Query here !!
END

END

END
ELSE
BEGIN
IF LEN(RTRIM(LTRIM(@userid))) = 0
BEGIN
IF @status = 1
BEGIN
-- SELECT Query here !!
END
ELSE
IF @status = 2
BEGIN
-- SELECT Query here !!
END
ELSE
BEGIN
-- SELECT Query here !!
END

END
ELSE
BEGIN
IF @status = 1
BEGIN
-- SELECT Query here !!
END
ELSE
IF @status = 2
BEGIN
-- SELECT Query here !!
END
ELSE
BEGIN
-- SELECT Query here !!
END

END

END