Changing the location of the tmp files when building InstaDMG images

Hi, I was wondering if it is possible to change the location of the temporary files that instaDMG creates when building images? If yes, how? I'm asking since my machine is partioned with two partitions - "os x" for the system and "work" for...yes you guessed it the work ;) The problem is my "os x" partition doesn't have enough room left (7GB) for the building proces, so I would like to use my "work" partition for the temporary files (50 GB left at the moment). I would appreciate any help a code Jedi might be able to give me and other people with the same problem. All the best Anders, Denmark