Passing Variables to a Function

<?php function getGallery($galleryLink, $altLink){

    global $post;

    // 1. search for any pages with a custom field of 'test' that have a value of 'yes'
    query_posts('meta_key='.$galleryLink.'&post_type=page');


    if ( have_posts() ) while ( have_posts() ) : the_post();
        // 2. echo the test field
        $link =  get_post_meta($post->ID, $galleryLink, true);
        $alt =  get_post_meta($post->ID, $altLink, true); ?>
    <img src="<?php echo $link ?>" alt="<?php echo $alt ?>" />
    <?php endwhile;

    wp_reset_query();

}?>

<?php getGallery('Gallery - Promotion Gallery Photo Link', 'Gallery - Promotion Gallery Photo Alt text'); ?>