Auto launch from Disk Image

I'd like to launch our installer application automatically when the image is mounted by disk copy.

I've got how to create the image down fine, it is the auto-run feature that I am looking for.

Any ideas?
AFAIK this isn't possible.. If you absolutely NEED an installer, just ship that (not in a disk image) but the recommended way of distributing apps for OSX is as self-contained drag-installable .app packages in a .dmg disk image.