From: pete on
It's concise, it's complete, and it's correct:

http://luke.breuer.com/tutorial/javascript-drag-and-drop-tutorial.aspx

I'm a JS beginner and I'd been trying for a year to get d-n-d working
using other tutorials. This is the only one I could understand and use
directly, very near to 100% cut-and-paste.

-- pete