To use this tool:
 1. Click around the perimeter of the area you want to map with the mouse.
 2. Click on the 'Generate Map Code' button above.
 3. Copy and paste the code that is generated into a text file, and save it as 'something.html'.
 e.g. 'Civic-Park.html' or 'Council-Depot.html' or 'Smelly-Waste-Water-Treatment-Plant.html'.