Google maps

hi guys,

i dont know if this is the right forum for my question.

i have seen this site: http://directory.myhammer.co.uk/london

and have noticed the google map on right side changes when i scroll down and look a particular entry, the map goes to the address of the entry that i am looking at.

do you have any idea how it works? thanks

The Maps JavaScript API ??
http://code.google.com/apis/maps/index.html