[OSM-dev] How do I do make shaded area overlays with openlayers or something similar?

[John Smith]

This site shows aussie postcodes over the top of a base layer:

http://www.aus-emaps.com/postcode_finder.php

How would I do something similar for postcodes in the OSM DB already,
and showing them as a shaded area, and 2 different colours if they've
been reviewed or not.

Something like this maybe:

http://www.censusdata.abs.gov.au/ABSNavigation/ImageServer?id=map,Census,2006,POA4480