I don't know what jurisdiction your XH is in, but from the little that I've read about it, he can apply for a modification through the court system. However, one could argue that the furlough is temporary and therefore it wouldn't be granted.
Here's some information for employees located in Virginia. I don't know about other states.
I'd contact your attorney and see how it would affect you directly.
[This message edited by Fireball72 at 9:42 PM, July 12th (Friday)]