I'm not finished yet (need docs and some more implementation details)
but here is the gist of my code.

Suggestions for improvement are encouraged (*privately* please - unless
you're certain ALL will be interested!)
-- 
Brad Appleton <bradapp@enteract.com> | http://www.enteract.com/~bradapp/
 "And miles to go before I sleep."   |  3700+ WWW links on CS & Sw-Eng