This is a plugin for displaying a hint inside an input field, only when it is blurred and has no value.
There are many plugins like these out there, I picked Remy Sharp’s 1 and added support for password fields,
using a strategy outlined by Roshan Bhattarai2.
1 http://remysharp.com/2007/01/25/jquery-tutorial-text-box-hints/
2 http://roshanbh.com.np/2008/03/show-text-in-the-password-field.html