Simulations and images are loaded from the original site:
http://intranet.vituscollege.nl/Vaklokalen/Natuurkunde/Applets/ll_menu/bovenbouw/5vgeluid_en_licht/zwevingengeluid/zwevingen.htm

Download options:

[html] - leaves the program files and images at the original site.
This resolves some copyright issues, but won't work off-line.

[zip] [exe] - for off-line use, attempts to download program and image files, too.
This may violate copyright on these resources (see 2.)

Copyright:

If you want to use this web page elsewhere you need to ask permission from

1. the author of the html page (the text)
2. the author of the resources (programs, images).
   - in case of Physlets (TM) see: Conditions.