Oh...perhaps you wanted an answer?
Everything done via a Google Maps application (like the one you linked to), is handled via javascript. The address of the page doesn't change when you navigate through the map - javascript handles all of your input, and it's separate from the page address.
However, smart page designers make up for this, but creating an alternative link button - that will load the page, passing it necessary data to redisplay the map per your wishes. Fortunately, the geogarage folks did this at the site you linked to.
Look in the bottom left corner of a map that you have zoomed in on. There's a "link" link. Click on it, and the URL will change - use that when you post here or elsewhere.