I would like to put in my map on site something similar like on this site

When choose Personalize Your Search, I need to get gps of circle center and zoom and radius.
How could I achieve this?
All help is appreciated.
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If you use the Google Maps API V3, then you have the google.maps.Circle class. The circle gives you all the information you are requesting through it’s methods:
It also has events, so that you can listen to mouse clicks on your map and move the circle to that click.