I have run into a problem that i cannot seem to figure out how to do and was hoping that you might have some insight.

im working on this page: <http://rrpcompliance.com/map/html/>

note: right now the only states i am focusing on are washington and idaho
i would like the user to only be able to select one state at a time
currently for instance, you can select washington and idaho both

for the life of me i cannot figure out how to tell the maphilight script to deactivate the other state after a new one has been clicked