if ($resize_images_or_not == 1) {
    $stimuli_lightbox_js = "lightbox-resize.js"; 
} else {
    $stimuli_lightbox_js = "lightbox.js"; 
}

if (!is_admin()) { // if we are *not* viewing an admin page, like writing a post or making a page:
    wp_enqueue_script('lightbox', ($stimuli_lightbox_plugin_prefix.$stimuli_lightbox_js), array('scriptaculous-effects'), '1.8');
}