global $post;

if($post->post_parent) {
$parent = $post->post_parent;
}
else {
$parent = $post->ID;

}

$args = array(
'depth' => 1,
'show_date' => '',
'date_format' => get_option('date_format'),
'child_of' => $parent,
'exclude' => '',
'include' => '',
'title_li' => __(''),
'echo' => 1,
'authors' => '',
'sort_column' => 'menu_order, post_title',
'link_before' => '<img class="grayArrow" src="http://sciteex.com/wp-content/uploads/2011/07/arrow_right_gray.png" alt="Gray Arrow">',
'link_after' => '',
'walker' => '' );

wp_list_pages($args);