sqlserver 2005 split function

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
GO
create function [dbo].[split](@str nvarchar(1000),@word varchar(5),@no
int) returns nvarchar(500)
as begin
    declare @len int
    declare @index int
    set @index=charindex(@word,@str)
    set    @index=len(@word)+@index-1
    set @len=len(@str)
    if @index >0  and @no=2
        return substring(@str,@index+1,@len)
    else if @index>0 and @no=1
        return substring(@str,0,@index-len(@word)+1)
        return @str
end