Populate Dropdown List box

Hi,

I have two dropdown box one is for the region and one for the area in the region.
when the user select from the region dropdown box it should populate the area dropdown box based on the selected region.

here's what I have so far:

function GetGeo(){

var SelFundIndex = document.ClientCustomer.cboRegion.selectedIndex;
var RegionVal = document.ClientCustomer.cboRegion.options[SelFundIndex].value

//here how can I send the value of this cboRegion to the area dropdown box.

}


<TR>
<TD>Region</TD>
<div ID="Div10">
<SELECT name="cboRegion" size="1" style="WIDTH: 130px" ID="Select20" onchange="GetGeo()">
<option selected value="">--Select One --</option>
<option value="Central">Central</option>
<option value="East">East</option>
<option value="West">East</option>
</SELECT>
</div>

<TD colspan=3>Area</TD>
<div ID="MenuHide11">
<TD colspan=3>
<SELECT name="cboSalesman" size="1" style="WIDTH: 130px" ID="Select2">
<option selected value="">--Select One --</option>
<%Do while not rsSalesman.Eof
If Trim(SalesmanID) = trim(rsSalesman("GeoKey")) then%>
<option value="<%=Trim(rsSalesman("GeoKey"))%>" selected><%=Trim(rsSalesman("GeoDescription"))%></option>
<%      else %>
<option value="<%=Trim(rsSalesman("GeoKey"))%>"><%=Trim(rsSalesman("GeoDescription"))%></option>
<%      end if
rsSalesman.MoveNext
Loop %>
</SELECT>
</div>
</TD>      
      
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