Add a metabox with uploader with below code - wordpress

Question

time ago, I found this code for custom meta boxes. It works well, but I'd like to add an image uploader. Since I can't remember where I found this code - and thus contact the author - is there anyone who can help me solve this issue?
$meta_boxes = array();
// Description
$meta_boxes[] = array(
'id' => 'descriptions',
'title' => 'Description',
'pages' => array('fleet', 'link'), // multiple post types
'context' => 'normal',
'priority' => 'high',
'fields' => array(
array(
'name' => 'Title',
'desc' => 'Insert a title here',
'id' => 'desc-title',
'type' => 'text',
'std' => 'Some problem'
),
)
);
foreach ($meta_boxes as $meta_box) {
$my_box = new My_meta_box($meta_box);
}
class My_meta_box {
protected $_meta_box;
// create meta box based on given data
function __construct($meta_box) {
$this->_meta_box = $meta_box;
add_action('admin_menu', array(&$this, 'add'));
add_action('save_post', array(&$this, 'save'));
}
/// Add meta box for multiple post types
function add() {
foreach ($this->_meta_box['pages'] as $page) {
add_meta_box($this->_meta_box['id'], $this->_meta_box['title'],
array(&$this, 'show'), $page, $this->_meta_box['context'], $this->_meta_box['priority']);
}
}
// Callback function to show fields in meta box
function show() {
global $post;
// Use nonce for verification
echo '<input type="hidden" name="mytheme_meta_box_nonce" value="', wp_create_nonce(basename(__FILE__)), '" />';
echo '<div>';
foreach ($this->_meta_box['fields'] as $field) {
// get current post meta data
$meta = get_post_meta($post->ID, $field['id'], true);
echo '<label for="', $field['id'], '">', $field['name'], '</label><br>';
switch ($field['type']) {
case 'text':
echo '<input type="text" name="', $field['id'], '" id="', $field['id'], '" value="', $meta ? $meta : $field['std'], '" size="30" style="width:97%" />',
'<br />', $field['desc'], '<br />';
break;
case 'textarea-side':
echo '<textarea name="', $field['id'], '" id="', $field['id'], '" value="'. $field['std'] .'" cols="60" rows="4" style="width:100%; height:25px; border:1px solid black;box-sizing:border-box;">'. get_post_meta($post->ID, $field['id'], true) .'</textarea>',
'<br />', $field['desc'], '<br />';
break;
case 'textarea-normal':
echo '<textarea name="', $field['id'], '" id="', $field['id'], '" value="'. $field['std'] .'" cols="60" rows="4" style="width:100%; height:300px; border:1px solid black;box-sizing:border-box;">'. get_post_meta($post->ID, $field['id'], true) .'</textarea>',
'<br />', $field['desc'], '<br />';
break;
case 'textarea-half':
echo '<textarea name="', $field['id'], '" id="', $field['id'], '" value="'. $field['std'] .'" cols="60" rows="4" style="width:50%; height:250px; border:1px solid black;box-sizing:border-box;">'. get_post_meta($post->ID, $field['id'], true) .'</textarea>';
break;
case 'select':
echo '<select name="', $field['id'], '" id="', $field['id'], '">';
foreach ($field['options'] as $option) {
echo '<option', $meta == $option ? ' selected="selected"' : '', '>', $option, '</option>';
}
echo '</select>';
break;
case 'radio':
foreach ($field['options'] as $option) {
echo '<input type="radio" name="', $field['id'], '" value="', $option['value'], '"', $meta == $option['value'] ? ' checked="checked"' : '', ' />', $option['name'];
}
break;
case 'checkbox':
echo '<input type="checkbox" name="', $field['id'], '" id="', $field['id'], '"', $meta ? ' checked="checked"' : '', ' /><br />';
break;
}
}
echo '</div>';
}
// Save data from meta box
function save($post_id) {
// verify nonce
if (!wp_verify_nonce($_POST['mytheme_meta_box_nonce'], basename(__FILE__))) {
return $post_id;
}
// check autosave
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
return $post_id;
}
// check permissions
if ('page' == $_POST['post_type']) {
if (!current_user_can('edit_page', $post_id)) {
return $post_id;
}
} elseif (!current_user_can('edit_post', $post_id)) {
return $post_id;
}
foreach ($this->_meta_box['fields'] as $field) {
$old = get_post_meta($post_id, $field['id'], true);
$new = $_POST[$field['id']];
if ($new && $new != $old) {
update_post_meta($post_id, $field['id'], $new);
} elseif ('' == $new && $old) {
delete_post_meta($post_id, $field['id'], $old);
}
}
}
}
Many thanks.