Possible to call JS function after AJAX postback?

Think I must be missing something cos it seems you'd just have to call the function to make this work, could you post your code and explain what' not working?

Sure thing - Module code:

function sbm_locator($form, &$form_state) {

    $form = array();
    $form['address'] = array(
        '#type' => 'textfield',
        '#title' => t('Address'),
    );
    $form['distance'] = array(
        '#title' => t("Select a Distance"),
        '#type' => 'select',
        '#options' => array(
            '10' => '10 Miles',
            '50' => '50 Miles',
            '100' => '100 Miles',
        ),
    );
    $form['submit'] = array(
        '#type' => 'button',
        '#value' => 'Locate',
        '#ajax' => array(
            'callback' => 'sbm_callback',
            'wrapper' => 'map_canvas',
            'effect' => 'fade',
        ),
    );
    $form['changeout'] = array(
        '#type' => 'textfield',
        '#title' => t(''),
        '#value' => "",
        '#prefix' => '<div id="map_canvas" style="width: 50%; height: 300px; float: left">',
        '#suffix' => '</div><div id="sidebar_results" style="width: 50%; float: left;margin-top: -13px;"><ul></ul></div>',
    );
     if (!empty($form_state['values']['address'])) {
        $coords = sbm_geocode($form_state['values']['address']);
        if (empty($coords))
            $retailers = "No results found";
        else {
            $retailers = sbm_find_markers($coords[1], $coords[0], $form_state['values']['distance']);
        }
        drupal_add_js(array('retailers' => $retailers), "setting");
    }
    return $form;
}
function sbm_callback($form, $form_state) {
     return $form['changeout'];
}

JS code - abbreviated:

function addMarkers(){
    var latlng = new google.maps.LatLng(34.397, -75.644);
    var myOptions = {
        zoom: 2,
        center: latlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById('map_canvas'),
        myOptions);
    var retailers = Drupal.settings.retailers.split('|');
    //console.log(retailers);
    bounds = new google.maps.LatLngBounds();
    
    for(var i = 0; i < retailers.length-1; i++) {
        if(retailers.length==0) {
            alert('No results found');
            break;
        }
        ...
        createMarker(map, lat, lng, name, ...);

    }  
    
    google.maps.event.addListener(map, 'click');

}
function createMarker(map, lat, lng, name, dist, number, address, alt) {
    var myLatLng = new google.maps.LatLng(lat, lng);
    var marker = new google.maps.Marker({
        position: myLatLng,
        map: map,
        title: name,
        clickable: true,
        id: marker+"-"+number
    });
    bounds.extend(myLatLng);
    map.fitBounds(bounds);  
   ...
}