To achieve this you can modify the Google Maps widget.
In the widget
Hi Chris,
Thanks for the answer. For the last thing you are mentioning; adding the lines to the map by altering googlemapsoverview.js, I am not quite sure where to alter the JS-file. Let's say I want a non-dynamical polygon drawn, see https://developers.google.com/maps/documentation/javascript/examples/polygon-simple?hl=nl, then where do I put the piece of code that draws the Polygon line on the map:
bermudaTriangle.setMap(map);
Hope anyone can help?