Here is an example set of captive portal and warning page web pages.
The haserl scripts and other contents in this directory are part of
squark suite and licensed under the GPL with the below mentioned
exceptions.

warning.png
  From Tango Icon library (Public Domain). Credits go to Tango Desktop
  Project.

worldmap.png
  Slightly modified version of:
    http://www.webresourcesdepot.com/wp-content/uploads/image/free-world-map-black-white.gif
  Should be free to use.