[jQuery] jquery.validate - differentFrom() ? Opposite of EqualTo.

[jQuery] jquery.validate - differentFrom() ? Opposite of EqualTo.


Hi,
I could use a hand with jquery validate. ( http://docs.jquery.com/Plugins/Validation
)
I have 3 dropdowns, containing the same selections, and I need to make
sure no selections are the same as either of the other two. (Primary,
secondary and tertiary contact - obviously can't be the same person).
There is EqualTo, which doesn't really solve my problem. Any good
ideas?
Thanks for reading, and thanks in advance for any help.