calling javascript function in user control

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="ChangeLocation.ascx.cs" Inherits="onlocal.UserControls.ChangeLocation" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<link href="../CSS/common.css" rel="stylesheet" type="text/css" />


 <script src="http://maps.google.com/maps?file=api&amp;v=2.x&amp;key=ABQIAAAAvpd8mjNgroIYlldQP4fM-hREifw3z0CLY54LRc8ZC14v-wuusRQrD9AaPPOw_rxAgdi_bPu9S-lQxg" type="text/javascript"></script>
    <script type="text/javascript">

    var map = null;
    var geocoder = null;
    function initialize() {
      if (GBrowserIsCompatible()) {
        map = new GMap2(document.getElementById("map_canvas"));
        map.setCenter(new GLatLng(37.4419, -122.1419), 13);
        geocoder = new GClientGeocoder();
      }
    }

    function showAddress(address) {
      if (geocoder) {
        geocoder.getLatLng(
          address,
          function(point) {
            if (!point) {
              alert(address + " not found");
            } else {
              map.setCenter(point, 13);
              var marker = new GMarker(point);
              map.addOverlay(marker);
              marker.openInfoWindowHtml(address);
            }
          }
        );
      }
    }
    alert('test link');
    initialize();
    alert('test link2');
    </script>

<cc1:ModalPopupExtender ID="ModalPopupChangeLocation" BehaviorID="ModalPopupChangeLocation"
    runat="server" BackgroundCssClass="modalBackground" TargetControlID="lnkDummy"
    PopupControlID="pnlModalPopupChangeLocation" CancelControlID="imgBtnCancel">
</cc1:ModalPopupExtender>
<asp:LinkButton ID="lnkDummy" runat="server"></asp:LinkButton>
<asp:Panel ID="pnlModalPopupchangelocation" runat="server" Style="display: none;">
<asp:UpdatePanel ID="updatechangelocation" runat="server">
        <ContentTemplate>
            <div style="width: 430px; height: 230px; overflow: hidden;" class="content" >
                <div class="blueNavPopUp" style="width: 430px;">
                    <div class="blueNavTextPopUp">
                        <asp:Label ID="lblTitle" runat="server" class="whiteTabText">Change
            Location</asp:Label></b></div>
                    <div class="collaspebtmPopUp">
                        <asp:ImageButton ID="imgBtnCancel" runat="server" ImageUrl="~/images/CloesImg.gif" OnClientClick="javascript:$find('ModalPopupChangeLocation').hide(); return false;"
                            alt="" /></div>
                </div>
            <p>
        <input type="text" size="60" name="address" value="1600 Amphitheatre Pky, Mountain View, CA" />
        <input type="submit" value="Go!" onclick="initialize(); return false;" />
      </p>
      <div id="map_canvas" style="width: 500px; height: 300px; background-color:Aqua;"></div>
</div>
        </ContentTemplate>
    </asp:UpdatePanel>
&nbsp;</asp:Panel><p>
    </p>