Just looked up on download.com.. got this program. Called Masterbooter, but I'm not sure if it offers support for OSX. It costs about 20 bucks but is free to at least try. Good luck!
http://www.download.com/MasterBooter/3000-2094_4-10398474.html?tag=lst-0-2
http://www.download.com/MasterBooter/3000-2094_4-10398474.html?tag=lst-0-2