Template SMARTY Google Maps

Bonjour,
J'utilise actuellement le code suivant :

INTEGRATING GOOGLE MAPS WITH SMARTY TEMPLATES
---------------------------------------------

Integrating with Smarty is as simple as assigning the necessary vars to the
template and then displaying them. Note: This example does not cover how to
setup Smarty, please use the Smarty documentation.

Example:

Code:

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<?php
    require('Smarty.class.php');
    require('GoogleMapAPI.class.php');
 
    $smarty = new Smarty();
    $map = new GoogleMapAPI();
 
    // setup database for geocode caching
    $map->setDSN('mysql://USER:PASS@localhost/GEOCODES');
    // enter YOUR Google Map Key
    $map->setAPIKey('YOURGOOGLEMAPKEY');
 
    // create some map markers
    $map->addMarkerByAddress('621 N 48th St # 6 Lincoln NE 68502','PJ Pizza','<b>PJ Pizza</b>');
    $map->addMarkerByAddress('826 P St Lincoln NE 68502','Old Chicago','<b>Old Chicago</b>');
    $map->addMarkerByAddress('3457 Holdrege St Lincoln NE 68502',"Valentino's","<b>Valentino's</b>");
 
    // assign Smarty variables;
 
    $smarty->assign('google_map_header',$map->getHeaderJS());
    $smarty->assign('google_map_js',$map->getMapJS());
    $smarty->assign('google_map_sidebar',$map->getSidebar());
    $smarty->assign('google_map',$map->getMap());
 
    // display the template
    $smarty->display('index.tpl');
    ?>

contents of index.tpl:
----------------------

Code:

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml">
    <head>
    {$google_map_header}
    {$google_map_js}
    <!-- necessary for google maps polyline drawing in IE -->
    <style type="text/css">
      v\:* {ldelim}
        behavior:url(#default#VML);
     {rdelim} 
    </style>
    </head>
    <body onload="onLoad()">
    <table>
      <tr>
        <td>{$google_map}</td>
        <td>{$google_map_sidebar}</td>
      </tr>
    </table>
    </body>
    </html>

sauf le problème est le suivant: la carte google maps est figée. Elle a un fond gris et ne bouge pas (piece jointe).
Quelqu'un a une idée ?
Merci bcp