[module MAP] geocoding field with gmap?

Hi,

I use map module and I need to add a field to search a location.
Simply like this: http://code.google.com/apis/maps/documentation/examples/geocoding-simple.html

How can i do that, can i make a modification in a file of module to add geocoding? in which file?
Or must i do a feature request?

Thanks for your help

http://rubbishbusters.com