New Domain for Site

A client of mine has two domains , both pointing to the same physical web site. The intention is to eliminate one of them in the near future. Unfortunately, the domain that will be discontinued happens to be listed here in DMOZ.

How can we "re-point" that listing to the proper domain before the current domain disappears?

Thanks!
Bill

We won't change the existing listing as long as the site still functions. Preferably you need to do a 301 redirect; or have something clearly on the site that directs the viewing user to the new site. Then put in an update request for the old site [in it's current category].