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With asp you must submit the page back to the server or navigate to the server with querystrings. The asp is all processed before the page is delivered to the browser. You can write all data to javascript arrays on the page so that when you use onchange it will use javascript to update your drop downs. The problem with this is it can be very confusing and complicated.
I suggest you resubmit the page with formname.submit() or just set the asp up to accept querystrings to repopulate your box.