Cabbie

hello, I am working on an unattended install cd and I have a question; I cant put office XP on the same cd as the unattended cd because it's to large. How can I make a line so that when I install windows it will ask for the office xp cd so that it can install? and when it's finised that it will ask for the first cd again so that it can continue? I found a topic which contains a explanation of how to use more cd's but I don't know how this works this is the topic thanks in advance