Auto updating select boxes - ASP

we have an asp form with two sets of select fields. The are From Country/State (fields 1 and 2 in code) To Country / State (fields 3 and 4 in code) We have a javascript file that auto updates the state (field 2) when the country (field 1) is selected We require the javascript modifying so that the second state select box (field 4) updates when the second country field (field 3) is selected. Please note the field "cityname" is actually the name of the state !