theme_gmap not working on ajax request

Hello,

I am having problem in google map , its showing me "Javascript is required to view this map" when i call google map using ajax.

I am using this code please and review this and tell me how can i solve this problem.

    $map_view = array(
        'zoom' => 5,
    'behavior' => 'autozoom',
    'width' => '210px',
    'height' => '300px',
    'latitude' => $map_latitude,
    'longitude'=> $map_longitude,
    'maptype' => 'Map',
    'markers' =>
    $markers,
    );
$outfittermap = theme('gmap', array('#settings' => $map_view));

echo '<div id="get_node_map">'.$outfittermap.'</div>';

IF i use same code without ajax and use return to print the map, its working fine.review the code below..

    return '<div id="get_node_map">'.$outfittermap.'</div>';

But i have to show google map on ajax request. Can Any one tell me how can i solve this problem ....

Thanks,