Google Maps API v3: Is there a callback or event listener for a setMap() event?

Question

I am using Google Maps API v3 on a website I am developing. I have a drop-down box beneath my map which allows the user to switch between different sets of markers to be display

Answer 1

Maybe this would help: http://www.basicslabs.com/Projects/progressBar/#Examples

and the example: http://www.basicslabs.com/Projects/progressBar/example/progressBar.html