The myredraw() function first creates an array that contains the HTML elements named 'place', i.e. the radio buttons. This array is looped though until the the checked element is located.
The value of the checked element is obtained (radio_value) and an if...else if...else clause used to
create a Google Maps LatLng object with a different coordinate pair.
The map division is then obtained, and the new zoom and map center set. Finally a new marker is added.