Moving a div from inside one div to another div using Prototype?

Question

In prototype or normal-but-cross-browser-compatible Javascript, how do I move the contents of a div to the contents of another div?

Inside the div is a form with ids

Answer 1

You can add this at the very end of the BODY tag:

MacGuffin will be moved automatically from one to the other.
And there won't be any flickering.