Hi Wim,
Latest TW versions have the possibility to save cookie settings within
the TW file. It's called persistent options [1]. I think for this
usecase you won't need a plugin.
The QOTD [2] info tiddler describes the plugin options. With the
cookie parameter you can specify the name of the cookie you want to
use to store the needed info.
The cookie name for SystemSettings will be:
txtQOTD_ + yourCookieName
so if yourCookieName is eg: "index" it is:
txtQOTD_index
SystemSettings tiddler should contain
txtQOTD_index: 1
it will be automatically refreshed by the core and saved with your
TW.
have fun!
mario
[1]
http://tiddlywiki.com/#PersistentOptions
[2]
http://www.tiddlytools.com/#QuoteOfTheDayPluginInfo