ui.mouse.js, ui.draggable.js, ui.draggable.ext.js & the Bibeault book

Hi. I have just worked through the *amazing* Bibeault "jQuaery in
Action" book and I want to build some "draggable()" stuff. But the
book describes the need for the following JS files:
- ui.mouse.js
- ui.draggable.js
- ui.draggable.ext.js
but these don't seem to exist - or at least I can't find them on
jQuery.com. What am I missing?
Alex