title: How to convert LatLng to (x , y) pixels and vice versa?
body: <p>I am using google maps API V3 and I want to create an editable 100px X 100px Rectangle when user clicks on the map. </p>
  
  <p>Now I only need to have (x,y) point that user clicks and then lat and lng of (x+100 , y+100).
  Any Idea?  </p>