
Simply put the quiver in one hand, and any time you put an arrow in the other hand, it will auto-load it. Dry-fire the bow to get an arrow out if you need one, otherwise, after shooting an arrow, another one will be automatically withdrawn, just like always.
http://www.ojnk.net/dm/quiver_demo.zip
Some possible exercises for the reader would be to--

- Make it more elegant, like be able to display what is in the quiver
- Give the quiver a maximum number of arrows
- Give it support for slayers or whatever else