Google Maps JS API v3 Single marker Multiple circles - google-maps-api-3

Question

Screenshot: http://imageshack.us/a/img59/8541/72825985.png
The above result is delivered by multiple markers(with different radius) on same spot.
I would like to drag a single marker at one time, not multiple markers.
Second, the infowindow is made available for different radius.
Any help is greatly appreciated!
var locations = [
['US gov suggested', 1.8833, 102.7833, 5, 'green', 80000],
['agricultural contamination', 1.8833, 102.7833, 4, 'blue', 60000],
['Chernobyl_Exclusion_Zone (fallout)', 1.8833, 102.7833, 3, 'yellow', 30000],
['Fukushima evacuation zone', 1.8833, 102.7833, 2, 'red', 20000],
['emergency zone', 1.8833, 102.7833, 1, 'black', 5000]
];
and
var infowindow = new google.maps.InfoWindow();
var marker, i;
for (i = 0; i < locations.length; i++) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
draggable: true,
map: map
});
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent(locations[i][0]);
infowindow.open(map, marker);
}
})(marker, i));
var circle = new google.maps.Circle({
map: map,
fillColor:locations[i][4],
//fillOpacity:0.3,
//strokeColor:locations[i][4],
strokeOpacity:0.1,
//strokeWeight:1,
radius: locations[i][5] // 30 km
});
circle.bindTo('center', marker, 'position');
}
References:
Google Maps JS API v3 - Simple Multiple Marker Example
http://code.google.com/p/gmaps-samples-v3/source/browse/trunk/circle-overlay/circle-overlay.html?r=67
http://plugins.svn.wordpress.org/google-maps-v3-shortcode-multiple-markers/trunk/

Answer 1

Create as much circles as you want to and bind the center-property of each circle to the position-property of the marker by using the method bindTo() of the circles

Answer 2

var infowindow = new google.maps.InfoWindow()
var marker, i;
marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[0][1], locations[0][2]),
draggable: true,
map: map
});
for (i = 0; i < locations.length; i++) {
var circle = new google.maps.Circle({
map: map,
clickable:true,
fillColor:locations[i][4],
//fillOpacity:0.3,
//strokeColor:locations[i][4],
strokeOpacity:0.1,
//strokeWeight:1,
radius: locations[i][5] // 30 km
});
circle.bindTo('center', marker, 'position');
Secondly, it not easy to add infowindow for multiple circle overlays. Any ideas or hints? For example, http://img443.imageshack.us/img443/8198/overlap.jpg
Reference:google maps v3 adding an info window to a circle