title: Google maps api v3 infowindow position in custom image
body: <p>I implemented the v3 of google maps in my site. I created custom images to show points on the map.</p>
  
  <p>One of the custom images is 120px X 120px size and i would like to point the arrow of infowindow in the center of this image and not on the top middle.</p>
  
  <p>How can i do that?</p>