Assigning javascript variable to java variable??

I'm working on a web app, and part of it is form to add/update customers information. What my problem is I have all the cities of the US and Canada in a database and was using javascript to load the cities depending on which province/state is selected from another list box. Because the database is so large it takes a long time and everytime the page loads it takes a long time because the java code runs. The cities are loaded into the page by a javabean which returns a vector with all of the cities. What I want to do is use the province or state id to pass to the bean and just retreive the cites for that state as oppose to loading all of them. However, I'm stuck with assigning that value from my list box, which I would use javascript to determine, then passing it as a parameter to the bean.
From the research I did, it seems like it can't be done. I'm seeking some advice thoough, as there would be someone who had this problem before and solved it or found a work around. Would be grateful for any help and advice. below is a part of my code that's presenting the obstacle.
<script type="text/javascript">
<!--
function fillCityList()
     var num=document.mDetails.provinceId.options[document.mDetails.provinceId.selectedIndex].value
     var boxlength=0
     document.mDetails.cityId.options.length = 0     
     <%     
     for ( int ctr=0;ctr<cityList.size();ctr++)
          City aCity = (City) cityList.elementAt(ctr); %>     
          if(num==<%= aCity.getProvinceId() %>)
                    document.mDetails.cityId.options[document.mDetails.cityId.options.length]=new Option("<%= aCity.getCityName() %>", "<%= aCity.getCityId() %>");     
     <% } %>           
// -->
</script>
</html>

How about doing this:
<html>
<head>
<script language="JavaScript">
vfnStateChange = function() {
     var oState = document.forms['myform'].state;
     var sState = oState.options[oState.selectedIndex].value;
     document.location.href='thispage.jsp?state=' + sState;
</script>
</head>
<body>
<form name="myform" action="somepage.jsp">
<select name="state" onchange="vfnStateChange();">
<%
ArrayList stateList = somebean.getStates();
for(int i = 0; i < stateList.size(); ctr++) {
     State s = (State)stateList.elementAt(i);
%>
<option value="<%= s.getStateId() %>"><%= s.getStateName() %></option>
<% } %>
</select>
<select name="city">
<%
String state = request.getParameter("state");
if(state == null) {
%>
<option value=""></option>
<%
} else {
     ArrayList cityList = somebean.getCities(state);
     for(int i = 0; i < cityList.size(); i++) {
          City c = (City)cityList.elementAt(i);
%>
<option value="<%= c.getCityId() %>" <%= c.getStateId().equals(state) ? "" : "selected=\"selected\"" %>><%= c.getCityName() %></option>
<%
%>
</select>
</form>
</body>
</html>

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    System.out.println("Table is not exists!");
    myStmt .close();
    myCon.close();
    @>

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