but I am still unable to get working this on my Glassfish (v2ur1-b09d-darwin) server running on Mac OS X 10.5.1
I entered in the admin console:
In the admin console, I selected tree node: Configuration -> HTTP-Service -> Virtual Server -> server
on the right panel, added a row to the property table,
property name: alternatedocroot_1
property value: from=/myimages/* dir=/images