Interdependent select menus
Notes
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I tried putting the javascript up in the <head> of the page,
but then it didn't work.
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This was originally showing four lines of the menus, like this:
<select size="4">
and then it had the "onClick" debugging code in place.
Moved the "onClick" code because it prevents from selecting
in the regular dropdown here.
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I got this code from
http://www.javascriptkit.com/javatutors/selectcontent2.shtml ,
where the code is explained.