SQL: Split function that parses comma delimated string

This is a function that I use frequently (also some of my friends). It is a function in Sql server, that parses a comma-deliminated string and returns a table. By returning a table, you can use this in joins. So, here is the function:

create function fn_Split(
@String nvarchar (4000),
@Delimiter nvarchar (10)
)
returns @ValueTable table ([Value] nvarchar(4000))
begin
declare @NextString nvarchar(4000)
declare @Pos int
declare @NextPos int
declare @CommaCheck nvarchar(1)

--Initialize
set @NextString = ''
set @CommaCheck = right(@String,1)

--Check for trailing Comma, if not exists, INSERT
if (@CommaCheck <> @Delimiter )
set @String = @String + @Delimiter

--Get position of first Comma
set @Pos = charindex(@Delimiter,@String)
set @NextPos = 1

--Loop while there is still a comma in the String of levels
while (@pos <> 0)
begin
set @NextString = substring(@String,1,@Pos - 1)
insert into @ValueTable ( [Value]) Values (@NextString)
set @String = substring(@String,@pos +1,len(@String))
set @NextPos = @Pos
set @pos = charindex(@Delimiter,@String)
end

return
end
go

How do we use it? Like that:
SELECT * FROM ServicesTable inner join dbo.fn_Split(@ServiceFilter, ',') tbl on tbl.[Value] = ServicesTable.Service)

* Here, the @ServiceFilter is something like "abc,xyz,123".