* do this on 10.5, otherwise the custom icon size / background will be lost.

useful Makefile to build a disk image: http://el-tramo.be/guides/fancy-dmg

update its line 67:

WC_DEV=`hdiutil info | grep "wc" | grep "/dev/" | awk '{print $$1}'` && hdiutil detach $$WC_DEV -quiet -force