Synchronizing dropdown lists

I'm wondering if anyone can steer me in the right direction on this:

I have a form with a couple of dropdown boxes for the State. One dropdown is at the top of the form, the other at the bottom.

What I'd like to do is if someone changes the value of either dropdown, it sync's up with the other dropdown. I've been trying variations of the selectedIndex, value, etc to no avail. Also to note, when the top value changes, it launches another javascript function to calculate some values. This recalc can happen when either changes, just that I want them to be in sync.

Any ideas?
 
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