Adding an object to an animation

Hi all, I am pretty new to animations but I would like to add an animation I've made to a piece of furniture so that when I sit on the furniture, a book appears in my hand. I've seen it done somewhere before but I can't remember where, and I would search for it, but I haven't the foggiest where to start! I'd imagine it's part of the script somewhere. Can anyone help me at all? It would be most appreciated.

Pillow Talk has stuff like this.

The way it works -- the book is always there, but turns invisible when no-one's sitting, then becomes visible when someone sits.

Yes, that is what I am after, I was hoping to be able to do it with an animation that I made I'll go hunting some more.

Ooooh I just re-read your post and now I understand, thank you

Alt-Ctl-T will reveal the magic.

the other way you can do it to reduce the prim count of the furniture is have it give the person sitting on it a book/whatever to wear while sitting on it. That way the person can move about, and the book wont be in just one spot, since it will be (most likely) in the avatars hand.