This is a correct way to do login form auto-focus, checking to see if either username or password have focus already. This prevents someone from typing a username hitting TAB, then having JavaScript chime in, resetting focus to Username while user is typing in their password. In this case, the password is appended to the username which is in plaintext.

A simple back button in JavaScript.

AJAX: In situ edit
A simple edit in place using Prototype, based on the tutorial @ 24ways.org

A prototype function to get an array of elements by id in an array

Toggles the visibility of an HTML element. Should be part of everyone's javascript toolkit

Cookie Handle

Fade an Element

Enhance External Links

Unobtrusive Kilometer/Mile Converte

Unobtrusive Show/Hide