Parsing xml from an url

[fbartolom]

Hullo,
I have a php function that returns an xml output I would use to populate a map with. I know how to do it in Objective C but I am left clueless about how to asynchronously execute operations with the date received from a url response in javascript.
The url is:
http://www.miafoto.it/iPhone/php/mapMarkers.php

and I would like to use the latitudes and longitudes in the response to populate a map by means of the following code:

var marker = new GMarker(new GLatLng(<Latitude>, <longitude>));
map.addOverlay(marker);

Thanks for your help,
Fabrizio