dftdemo.html - tiny javascript/canvas app for demontrating DFT
  Copyright (C) 2011  Clifford Wolf <clifford@clifford.at>

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  ---------------------------------------------------------------------

  Tested with Firefox 3. A browser with canvas support is needed to use
  this script.