Select drop down list value based on selection in pop up page

I have a page that contains a drop down list of values.
Next to the drop down, I have an clickable image icon that pops up a new window that allows the user to search and select for a value.

When the user clicks on that value in the pop up window, the id is then returned to the parent page.
How can I set the selected value of the drop down with the value that was selected on the popup page?
'Need to set the selected value of this drop down
'based on what the user selects in the pop up window
<asp:DropDownList ID="DropDownList1" runat="server">
<input type="text" name="CustomerID" value  "" />                                                        
                                                        <img alt="" src="icon_preview.gif" onclick='targetitem = document.forms[0].CustomerID;dataitem ="CustomerLookup.aspx", "dataitem", "toolbar=no,menubar=no,width=550,height=500"); dataitem.targetitem = targetitem' />
Popup page
    <script type="text/javascript"> 
    function select_item(item)     {
        targetitem.value = item;
        return false;
This is actually in a grid
                            <a href="" onclick='return select_item("<%#Eval("CustomerID")%>")'> <%#Eval("FirstName")%> <%#Eval("LastName")%></a>

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Steve KrileConnect With a Mentor Commented:
Sweet.  So, here is how I'd do what you are trying to accomplish - please not that a lot of the code below would need to be cleaned up for it to "work", things like data connections and page configurations to properly reference the Ajax toolkit.

.aspx Page:

          <asp:UpdatePanel runat="server" ID="MainContent" UpdateMode="Conditional">
                  <asp:AsyncPostBackTrigger ControlID="MyGrid" EventName="SelectedIndexChanged"
                  <asp:Label runat="server" ID="SelectedID" />
                <asp:DropDownList runat="server" ID="MyList" >
                      <asp:ListItem Text="val1" Value="0" />
                      <asp:ListItem Text="val2" Value="1" />
                  <asp:ImageButton runat="server" ID="ModalShow" ImageUrl="~/images/myimagebutton.gif" />
                  <asp:Panel runat="server" ID="MyModal" Style="display:none;">
                      <asp:SqlDataSource ID="MyGridData" Runat="server" />
                      <asp:GridView ID="MyGrid" runat="server"  
                          OnSelectedIndexChanged="MyGrid_Selected" />
                      <asp:Button runat="server" ID="CloseModal" Text="Cancel" />
                  <cc1:ModalPopupExtender runat="server" ID="MyModalExtender"
                      PopupControlID="MyModal" TargetControlID="ModalShow"
                      CancelControlID="CloseModal" />

.aspx.vb page:

    Protected Sub MyGrid_Selected(ByVal sender As Object, ByVal e As EventArgs) Handles MyGrid.SelectedIndexChanged
        Dim MyID As Integer = CType(MyGrid.SelectedDataKey.Value, Integer)
        SelectedID.Text = MyID.ToString()
    End Sub
Steve KrileCommented:
Sorry for the misdirection here, but is this an Ajax enabled application.  If so, sounds like what you really could use is a Modal Popup and Update panel.  If you respond back saying, "Yeah, I could use Ajax", I'll hook you up with a pretty simple way of getting what you want here.
JRockFLAuthor Commented:
Yeah I could use Ajax
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