title: Google Maps API - Offset for Marker Image - Replace Marker - Not at GeoPosition
body: <p>I've an image (a circle) which should indicate a specific metropolitan area. Also I've got the <code>GeoPosition</code> of all my relevant areas. </p>
  
  <p>If I place my markers, the bottom-center of my image is at the marker's <code>GeoPosition</code>. But because its an aerial view I'd like to give the image an offset, so the <strong>center</strong> of my cirle-image is at that <code>GeoPosition</code>...</p>
  
  <p>Any ideas how to achieve this?</p>
  
  <p>Thanks!</p>